1 //===- Decl.cpp - Declaration AST Node Implementation ---------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file implements the Decl subclasses.
11 //===----------------------------------------------------------------------===//
13 #include "clang/AST/Decl.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ASTDiagnostic.h"
17 #include "clang/AST/ASTLambda.h"
18 #include "clang/AST/ASTMutationListener.h"
19 #include "clang/AST/CanonicalType.h"
20 #include "clang/AST/DeclBase.h"
21 #include "clang/AST/DeclCXX.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/DeclOpenMP.h"
24 #include "clang/AST/DeclTemplate.h"
25 #include "clang/AST/DeclarationName.h"
26 #include "clang/AST/Expr.h"
27 #include "clang/AST/ExprCXX.h"
28 #include "clang/AST/ExternalASTSource.h"
29 #include "clang/AST/ODRHash.h"
30 #include "clang/AST/PrettyDeclStackTrace.h"
31 #include "clang/AST/PrettyPrinter.h"
32 #include "clang/AST/Redeclarable.h"
33 #include "clang/AST/Stmt.h"
34 #include "clang/AST/TemplateBase.h"
35 #include "clang/AST/Type.h"
36 #include "clang/AST/TypeLoc.h"
37 #include "clang/Basic/Builtins.h"
38 #include "clang/Basic/IdentifierTable.h"
39 #include "clang/Basic/LLVM.h"
40 #include "clang/Basic/LangOptions.h"
41 #include "clang/Basic/Linkage.h"
42 #include "clang/Basic/Module.h"
43 #include "clang/Basic/PartialDiagnostic.h"
44 #include "clang/Basic/SanitizerBlacklist.h"
45 #include "clang/Basic/Sanitizers.h"
46 #include "clang/Basic/SourceLocation.h"
47 #include "clang/Basic/SourceManager.h"
48 #include "clang/Basic/Specifiers.h"
49 #include "clang/Basic/TargetCXXABI.h"
50 #include "clang/Basic/TargetInfo.h"
51 #include "clang/Basic/Visibility.h"
52 #include "llvm/ADT/APSInt.h"
53 #include "llvm/ADT/ArrayRef.h"
54 #include "llvm/ADT/None.h"
55 #include "llvm/ADT/Optional.h"
56 #include "llvm/ADT/STLExtras.h"
57 #include "llvm/ADT/SmallVector.h"
58 #include "llvm/ADT/StringSwitch.h"
59 #include "llvm/ADT/StringRef.h"
60 #include "llvm/ADT/Triple.h"
61 #include "llvm/Support/Casting.h"
62 #include "llvm/Support/ErrorHandling.h"
63 #include "llvm/Support/raw_ostream.h"
71 #include <type_traits>
73 using namespace clang;
75 Decl *clang::getPrimaryMergedDecl(Decl *D) {
76 return D->getASTContext().getPrimaryMergedDecl(D);
79 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
80 SourceLocation Loc = this->Loc;
81 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
83 Loc.print(OS, Context.getSourceManager());
88 if (auto *ND = dyn_cast_or_null<NamedDecl>(TheDecl)) {
90 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), true);
97 // Defined here so that it can be inlined into its direct callers.
98 bool Decl::isOutOfLine() const {
99 return !getLexicalDeclContext()->Equals(getDeclContext());
102 TranslationUnitDecl::TranslationUnitDecl(ASTContext &ctx)
103 : Decl(TranslationUnit, nullptr, SourceLocation()),
104 DeclContext(TranslationUnit), Ctx(ctx) {}
106 //===----------------------------------------------------------------------===//
107 // NamedDecl Implementation
108 //===----------------------------------------------------------------------===//
110 // Visibility rules aren't rigorously externally specified, but here
111 // are the basic principles behind what we implement:
113 // 1. An explicit visibility attribute is generally a direct expression
114 // of the user's intent and should be honored. Only the innermost
115 // visibility attribute applies. If no visibility attribute applies,
116 // global visibility settings are considered.
118 // 2. There is one caveat to the above: on or in a template pattern,
119 // an explicit visibility attribute is just a default rule, and
120 // visibility can be decreased by the visibility of template
121 // arguments. But this, too, has an exception: an attribute on an
122 // explicit specialization or instantiation causes all the visibility
123 // restrictions of the template arguments to be ignored.
125 // 3. A variable that does not otherwise have explicit visibility can
126 // be restricted by the visibility of its type.
128 // 4. A visibility restriction is explicit if it comes from an
129 // attribute (or something like it), not a global visibility setting.
130 // When emitting a reference to an external symbol, visibility
131 // restrictions are ignored unless they are explicit.
133 // 5. When computing the visibility of a non-type, including a
134 // non-type member of a class, only non-type visibility restrictions
135 // are considered: the 'visibility' attribute, global value-visibility
136 // settings, and a few special cases like __private_extern.
138 // 6. When computing the visibility of a type, including a type member
139 // of a class, only type visibility restrictions are considered:
140 // the 'type_visibility' attribute and global type-visibility settings.
141 // However, a 'visibility' attribute counts as a 'type_visibility'
142 // attribute on any declaration that only has the former.
144 // The visibility of a "secondary" entity, like a template argument,
145 // is computed using the kind of that entity, not the kind of the
146 // primary entity for which we are computing visibility. For example,
147 // the visibility of a specialization of either of these templates:
148 // template <class T, bool (&compare)(T, X)> bool has_match(list<T>, X);
149 // template <class T, bool (&compare)(T, X)> class matcher;
150 // is restricted according to the type visibility of the argument 'T',
151 // the type visibility of 'bool(&)(T,X)', and the value visibility of
152 // the argument function 'compare'. That 'has_match' is a value
153 // and 'matcher' is a type only matters when looking for attributes
154 // and settings from the immediate context.
156 /// Does this computation kind permit us to consider additional
157 /// visibility settings from attributes and the like?
158 static bool hasExplicitVisibilityAlready(LVComputationKind computation) {
159 return computation.IgnoreExplicitVisibility;
162 /// Given an LVComputationKind, return one of the same type/value sort
163 /// that records that it already has explicit visibility.
164 static LVComputationKind
165 withExplicitVisibilityAlready(LVComputationKind Kind) {
166 Kind.IgnoreExplicitVisibility = true;
170 static Optional<Visibility> getExplicitVisibility(const NamedDecl *D,
171 LVComputationKind kind) {
172 assert(!kind.IgnoreExplicitVisibility &&
173 "asking for explicit visibility when we shouldn't be");
174 return D->getExplicitVisibility(kind.getExplicitVisibilityKind());
177 /// Is the given declaration a "type" or a "value" for the purposes of
178 /// visibility computation?
179 static bool usesTypeVisibility(const NamedDecl *D) {
180 return isa<TypeDecl>(D) ||
181 isa<ClassTemplateDecl>(D) ||
182 isa<ObjCInterfaceDecl>(D);
185 /// Does the given declaration have member specialization information,
186 /// and if so, is it an explicit specialization?
187 template <class T> static typename
188 std::enable_if<!std::is_base_of<RedeclarableTemplateDecl, T>::value, bool>::type
189 isExplicitMemberSpecialization(const T *D) {
190 if (const MemberSpecializationInfo *member =
191 D->getMemberSpecializationInfo()) {
192 return member->isExplicitSpecialization();
197 /// For templates, this question is easier: a member template can't be
198 /// explicitly instantiated, so there's a single bit indicating whether
199 /// or not this is an explicit member specialization.
200 static bool isExplicitMemberSpecialization(const RedeclarableTemplateDecl *D) {
201 return D->isMemberSpecialization();
204 /// Given a visibility attribute, return the explicit visibility
205 /// associated with it.
207 static Visibility getVisibilityFromAttr(const T *attr) {
208 switch (attr->getVisibility()) {
210 return DefaultVisibility;
212 return HiddenVisibility;
214 return ProtectedVisibility;
216 llvm_unreachable("bad visibility kind");
219 /// Return the explicit visibility of the given declaration.
220 static Optional<Visibility> getVisibilityOf(const NamedDecl *D,
221 NamedDecl::ExplicitVisibilityKind kind) {
222 // If we're ultimately computing the visibility of a type, look for
223 // a 'type_visibility' attribute before looking for 'visibility'.
224 if (kind == NamedDecl::VisibilityForType) {
225 if (const auto *A = D->getAttr<TypeVisibilityAttr>()) {
226 return getVisibilityFromAttr(A);
230 // If this declaration has an explicit visibility attribute, use it.
231 if (const auto *A = D->getAttr<VisibilityAttr>()) {
232 return getVisibilityFromAttr(A);
238 LinkageInfo LinkageComputer::getLVForType(const Type &T,
239 LVComputationKind computation) {
240 if (computation.IgnoreAllVisibility)
241 return LinkageInfo(T.getLinkage(), DefaultVisibility, true);
242 return getTypeLinkageAndVisibility(&T);
245 /// Get the most restrictive linkage for the types in the given
246 /// template parameter list. For visibility purposes, template
247 /// parameters are part of the signature of a template.
248 LinkageInfo LinkageComputer::getLVForTemplateParameterList(
249 const TemplateParameterList *Params, LVComputationKind computation) {
251 for (const NamedDecl *P : *Params) {
252 // Template type parameters are the most common and never
253 // contribute to visibility, pack or not.
254 if (isa<TemplateTypeParmDecl>(P))
257 // Non-type template parameters can be restricted by the value type, e.g.
258 // template <enum X> class A { ... };
259 // We have to be careful here, though, because we can be dealing with
261 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
262 // Handle the non-pack case first.
263 if (!NTTP->isExpandedParameterPack()) {
264 if (!NTTP->getType()->isDependentType()) {
265 LV.merge(getLVForType(*NTTP->getType(), computation));
270 // Look at all the types in an expanded pack.
271 for (unsigned i = 0, n = NTTP->getNumExpansionTypes(); i != n; ++i) {
272 QualType type = NTTP->getExpansionType(i);
273 if (!type->isDependentType())
274 LV.merge(getTypeLinkageAndVisibility(type));
279 // Template template parameters can be restricted by their
280 // template parameters, recursively.
281 const auto *TTP = cast<TemplateTemplateParmDecl>(P);
283 // Handle the non-pack case first.
284 if (!TTP->isExpandedParameterPack()) {
285 LV.merge(getLVForTemplateParameterList(TTP->getTemplateParameters(),
290 // Look at all expansions in an expanded pack.
291 for (unsigned i = 0, n = TTP->getNumExpansionTemplateParameters();
293 LV.merge(getLVForTemplateParameterList(
294 TTP->getExpansionTemplateParameters(i), computation));
301 static const Decl *getOutermostFuncOrBlockContext(const Decl *D) {
302 const Decl *Ret = nullptr;
303 const DeclContext *DC = D->getDeclContext();
304 while (DC->getDeclKind() != Decl::TranslationUnit) {
305 if (isa<FunctionDecl>(DC) || isa<BlockDecl>(DC))
306 Ret = cast<Decl>(DC);
307 DC = DC->getParent();
312 /// Get the most restrictive linkage for the types and
313 /// declarations in the given template argument list.
315 /// Note that we don't take an LVComputationKind because we always
316 /// want to honor the visibility of template arguments in the same way.
318 LinkageComputer::getLVForTemplateArgumentList(ArrayRef<TemplateArgument> Args,
319 LVComputationKind computation) {
322 for (const TemplateArgument &Arg : Args) {
323 switch (Arg.getKind()) {
324 case TemplateArgument::Null:
325 case TemplateArgument::Integral:
326 case TemplateArgument::Expression:
329 case TemplateArgument::Type:
330 LV.merge(getLVForType(*Arg.getAsType(), computation));
333 case TemplateArgument::Declaration: {
334 const NamedDecl *ND = Arg.getAsDecl();
335 assert(!usesTypeVisibility(ND));
336 LV.merge(getLVForDecl(ND, computation));
340 case TemplateArgument::NullPtr:
341 LV.merge(getTypeLinkageAndVisibility(Arg.getNullPtrType()));
344 case TemplateArgument::Template:
345 case TemplateArgument::TemplateExpansion:
346 if (TemplateDecl *Template =
347 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl())
348 LV.merge(getLVForDecl(Template, computation));
351 case TemplateArgument::Pack:
352 LV.merge(getLVForTemplateArgumentList(Arg.getPackAsArray(), computation));
355 llvm_unreachable("bad template argument kind");
362 LinkageComputer::getLVForTemplateArgumentList(const TemplateArgumentList &TArgs,
363 LVComputationKind computation) {
364 return getLVForTemplateArgumentList(TArgs.asArray(), computation);
367 static bool shouldConsiderTemplateVisibility(const FunctionDecl *fn,
368 const FunctionTemplateSpecializationInfo *specInfo) {
369 // Include visibility from the template parameters and arguments
370 // only if this is not an explicit instantiation or specialization
371 // with direct explicit visibility. (Implicit instantiations won't
372 // have a direct attribute.)
373 if (!specInfo->isExplicitInstantiationOrSpecialization())
376 return !fn->hasAttr<VisibilityAttr>();
379 /// Merge in template-related linkage and visibility for the given
380 /// function template specialization.
382 /// We don't need a computation kind here because we can assume
385 /// \param[out] LV the computation to use for the parent
386 void LinkageComputer::mergeTemplateLV(
387 LinkageInfo &LV, const FunctionDecl *fn,
388 const FunctionTemplateSpecializationInfo *specInfo,
389 LVComputationKind computation) {
390 bool considerVisibility =
391 shouldConsiderTemplateVisibility(fn, specInfo);
393 // Merge information from the template parameters.
394 FunctionTemplateDecl *temp = specInfo->getTemplate();
396 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
397 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
399 // Merge information from the template arguments.
400 const TemplateArgumentList &templateArgs = *specInfo->TemplateArguments;
401 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
402 LV.mergeMaybeWithVisibility(argsLV, considerVisibility);
405 /// Does the given declaration have a direct visibility attribute
406 /// that would match the given rules?
407 static bool hasDirectVisibilityAttribute(const NamedDecl *D,
408 LVComputationKind computation) {
409 if (computation.IgnoreAllVisibility)
412 return (computation.isTypeVisibility() && D->hasAttr<TypeVisibilityAttr>()) ||
413 D->hasAttr<VisibilityAttr>();
416 /// Should we consider visibility associated with the template
417 /// arguments and parameters of the given class template specialization?
418 static bool shouldConsiderTemplateVisibility(
419 const ClassTemplateSpecializationDecl *spec,
420 LVComputationKind computation) {
421 // Include visibility from the template parameters and arguments
422 // only if this is not an explicit instantiation or specialization
423 // with direct explicit visibility (and note that implicit
424 // instantiations won't have a direct attribute).
426 // Furthermore, we want to ignore template parameters and arguments
427 // for an explicit specialization when computing the visibility of a
428 // member thereof with explicit visibility.
430 // This is a bit complex; let's unpack it.
432 // An explicit class specialization is an independent, top-level
433 // declaration. As such, if it or any of its members has an
434 // explicit visibility attribute, that must directly express the
435 // user's intent, and we should honor it. The same logic applies to
436 // an explicit instantiation of a member of such a thing.
438 // Fast path: if this is not an explicit instantiation or
439 // specialization, we always want to consider template-related
440 // visibility restrictions.
441 if (!spec->isExplicitInstantiationOrSpecialization())
444 // This is the 'member thereof' check.
445 if (spec->isExplicitSpecialization() &&
446 hasExplicitVisibilityAlready(computation))
449 return !hasDirectVisibilityAttribute(spec, computation);
452 /// Merge in template-related linkage and visibility for the given
453 /// class template specialization.
454 void LinkageComputer::mergeTemplateLV(
455 LinkageInfo &LV, const ClassTemplateSpecializationDecl *spec,
456 LVComputationKind computation) {
457 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
459 // Merge information from the template parameters, but ignore
460 // visibility if we're only considering template arguments.
462 ClassTemplateDecl *temp = spec->getSpecializedTemplate();
464 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
465 LV.mergeMaybeWithVisibility(tempLV,
466 considerVisibility && !hasExplicitVisibilityAlready(computation));
468 // Merge information from the template arguments. We ignore
469 // template-argument visibility if we've got an explicit
470 // instantiation with a visibility attribute.
471 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
472 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
473 if (considerVisibility)
474 LV.mergeVisibility(argsLV);
475 LV.mergeExternalVisibility(argsLV);
478 /// Should we consider visibility associated with the template
479 /// arguments and parameters of the given variable template
480 /// specialization? As usual, follow class template specialization
481 /// logic up to initialization.
482 static bool shouldConsiderTemplateVisibility(
483 const VarTemplateSpecializationDecl *spec,
484 LVComputationKind computation) {
485 // Include visibility from the template parameters and arguments
486 // only if this is not an explicit instantiation or specialization
487 // with direct explicit visibility (and note that implicit
488 // instantiations won't have a direct attribute).
489 if (!spec->isExplicitInstantiationOrSpecialization())
492 // An explicit variable specialization is an independent, top-level
493 // declaration. As such, if it has an explicit visibility attribute,
494 // that must directly express the user's intent, and we should honor
496 if (spec->isExplicitSpecialization() &&
497 hasExplicitVisibilityAlready(computation))
500 return !hasDirectVisibilityAttribute(spec, computation);
503 /// Merge in template-related linkage and visibility for the given
504 /// variable template specialization. As usual, follow class template
505 /// specialization logic up to initialization.
506 void LinkageComputer::mergeTemplateLV(LinkageInfo &LV,
507 const VarTemplateSpecializationDecl *spec,
508 LVComputationKind computation) {
509 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
511 // Merge information from the template parameters, but ignore
512 // visibility if we're only considering template arguments.
514 VarTemplateDecl *temp = spec->getSpecializedTemplate();
516 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
517 LV.mergeMaybeWithVisibility(tempLV,
518 considerVisibility && !hasExplicitVisibilityAlready(computation));
520 // Merge information from the template arguments. We ignore
521 // template-argument visibility if we've got an explicit
522 // instantiation with a visibility attribute.
523 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
524 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
525 if (considerVisibility)
526 LV.mergeVisibility(argsLV);
527 LV.mergeExternalVisibility(argsLV);
530 static bool useInlineVisibilityHidden(const NamedDecl *D) {
531 // FIXME: we should warn if -fvisibility-inlines-hidden is used with c.
532 const LangOptions &Opts = D->getASTContext().getLangOpts();
533 if (!Opts.CPlusPlus || !Opts.InlineVisibilityHidden)
536 const auto *FD = dyn_cast<FunctionDecl>(D);
540 TemplateSpecializationKind TSK = TSK_Undeclared;
541 if (FunctionTemplateSpecializationInfo *spec
542 = FD->getTemplateSpecializationInfo()) {
543 TSK = spec->getTemplateSpecializationKind();
544 } else if (MemberSpecializationInfo *MSI =
545 FD->getMemberSpecializationInfo()) {
546 TSK = MSI->getTemplateSpecializationKind();
549 const FunctionDecl *Def = nullptr;
550 // InlineVisibilityHidden only applies to definitions, and
551 // isInlined() only gives meaningful answers on definitions
553 return TSK != TSK_ExplicitInstantiationDeclaration &&
554 TSK != TSK_ExplicitInstantiationDefinition &&
555 FD->hasBody(Def) && Def->isInlined() && !Def->hasAttr<GNUInlineAttr>();
558 template <typename T> static bool isFirstInExternCContext(T *D) {
559 const T *First = D->getFirstDecl();
560 return First->isInExternCContext();
563 static bool isSingleLineLanguageLinkage(const Decl &D) {
564 if (const auto *SD = dyn_cast<LinkageSpecDecl>(D.getDeclContext()))
565 if (!SD->hasBraces())
570 /// Determine whether D is declared in the purview of a named module.
571 static bool isInModulePurview(const NamedDecl *D) {
572 if (auto *M = D->getOwningModule())
573 return M->isModulePurview();
577 static bool isExportedFromModuleInterfaceUnit(const NamedDecl *D) {
578 // FIXME: Handle isModulePrivate.
579 switch (D->getModuleOwnershipKind()) {
580 case Decl::ModuleOwnershipKind::Unowned:
581 case Decl::ModuleOwnershipKind::ModulePrivate:
583 case Decl::ModuleOwnershipKind::Visible:
584 case Decl::ModuleOwnershipKind::VisibleWhenImported:
585 return isInModulePurview(D);
587 llvm_unreachable("unexpected module ownership kind");
590 static LinkageInfo getInternalLinkageFor(const NamedDecl *D) {
591 // Internal linkage declarations within a module interface unit are modeled
592 // as "module-internal linkage", which means that they have internal linkage
593 // formally but can be indirectly accessed from outside the module via inline
594 // functions and templates defined within the module.
595 if (isInModulePurview(D))
596 return LinkageInfo(ModuleInternalLinkage, DefaultVisibility, false);
598 return LinkageInfo::internal();
601 static LinkageInfo getExternalLinkageFor(const NamedDecl *D) {
602 // C++ Modules TS [basic.link]/6.8:
603 // - A name declared at namespace scope that does not have internal linkage
604 // by the previous rules and that is introduced by a non-exported
605 // declaration has module linkage.
606 if (isInModulePurview(D) && !isExportedFromModuleInterfaceUnit(
607 cast<NamedDecl>(D->getCanonicalDecl())))
608 return LinkageInfo(ModuleLinkage, DefaultVisibility, false);
610 return LinkageInfo::external();
613 static StorageClass getStorageClass(const Decl *D) {
614 if (auto *TD = dyn_cast<TemplateDecl>(D))
615 D = TD->getTemplatedDecl();
617 if (auto *VD = dyn_cast<VarDecl>(D))
618 return VD->getStorageClass();
619 if (auto *FD = dyn_cast<FunctionDecl>(D))
620 return FD->getStorageClass();
626 LinkageComputer::getLVForNamespaceScopeDecl(const NamedDecl *D,
627 LVComputationKind computation,
628 bool IgnoreVarTypeLinkage) {
629 assert(D->getDeclContext()->getRedeclContext()->isFileContext() &&
630 "Not a name having namespace scope");
631 ASTContext &Context = D->getASTContext();
633 // C++ [basic.link]p3:
634 // A name having namespace scope (3.3.6) has internal linkage if it
637 if (getStorageClass(D->getCanonicalDecl()) == SC_Static) {
638 // - a variable, variable template, function, or function template
639 // that is explicitly declared static; or
640 // (This bullet corresponds to C99 6.2.2p3.)
641 return getInternalLinkageFor(D);
644 if (const auto *Var = dyn_cast<VarDecl>(D)) {
645 // - a non-template variable of non-volatile const-qualified type, unless
646 // - it is explicitly declared extern, or
647 // - it is inline or exported, or
648 // - it was previously declared and the prior declaration did not have
650 // (There is no equivalent in C99.)
651 if (Context.getLangOpts().CPlusPlus &&
652 Var->getType().isConstQualified() &&
653 !Var->getType().isVolatileQualified() &&
655 !isExportedFromModuleInterfaceUnit(Var) &&
656 !isa<VarTemplateSpecializationDecl>(Var) &&
657 !Var->getDescribedVarTemplate()) {
658 const VarDecl *PrevVar = Var->getPreviousDecl();
660 return getLVForDecl(PrevVar, computation);
662 if (Var->getStorageClass() != SC_Extern &&
663 Var->getStorageClass() != SC_PrivateExtern &&
664 !isSingleLineLanguageLinkage(*Var))
665 return getInternalLinkageFor(Var);
668 for (const VarDecl *PrevVar = Var->getPreviousDecl(); PrevVar;
669 PrevVar = PrevVar->getPreviousDecl()) {
670 if (PrevVar->getStorageClass() == SC_PrivateExtern &&
671 Var->getStorageClass() == SC_None)
672 return getDeclLinkageAndVisibility(PrevVar);
673 // Explicitly declared static.
674 if (PrevVar->getStorageClass() == SC_Static)
675 return getInternalLinkageFor(Var);
677 } else if (const auto *IFD = dyn_cast<IndirectFieldDecl>(D)) {
678 // - a data member of an anonymous union.
679 const VarDecl *VD = IFD->getVarDecl();
680 assert(VD && "Expected a VarDecl in this IndirectFieldDecl!");
681 return getLVForNamespaceScopeDecl(VD, computation, IgnoreVarTypeLinkage);
683 assert(!isa<FieldDecl>(D) && "Didn't expect a FieldDecl!");
685 // FIXME: This gives internal linkage to names that should have no linkage
686 // (those not covered by [basic.link]p6).
687 if (D->isInAnonymousNamespace()) {
688 const auto *Var = dyn_cast<VarDecl>(D);
689 const auto *Func = dyn_cast<FunctionDecl>(D);
690 // FIXME: The check for extern "C" here is not justified by the standard
691 // wording, but we retain it from the pre-DR1113 model to avoid breaking
694 // C++11 [basic.link]p4:
695 // An unnamed namespace or a namespace declared directly or indirectly
696 // within an unnamed namespace has internal linkage.
697 if ((!Var || !isFirstInExternCContext(Var)) &&
698 (!Func || !isFirstInExternCContext(Func)))
699 return getInternalLinkageFor(D);
702 // Set up the defaults.
705 // If the declaration of an identifier for an object has file
706 // scope and no storage-class specifier, its linkage is
708 LinkageInfo LV = getExternalLinkageFor(D);
710 if (!hasExplicitVisibilityAlready(computation)) {
711 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation)) {
712 LV.mergeVisibility(*Vis, true);
714 // If we're declared in a namespace with a visibility attribute,
715 // use that namespace's visibility, and it still counts as explicit.
716 for (const DeclContext *DC = D->getDeclContext();
717 !isa<TranslationUnitDecl>(DC);
718 DC = DC->getParent()) {
719 const auto *ND = dyn_cast<NamespaceDecl>(DC);
721 if (Optional<Visibility> Vis = getExplicitVisibility(ND, computation)) {
722 LV.mergeVisibility(*Vis, true);
728 // Add in global settings if the above didn't give us direct visibility.
729 if (!LV.isVisibilityExplicit()) {
730 // Use global type/value visibility as appropriate.
731 Visibility globalVisibility =
732 computation.isValueVisibility()
733 ? Context.getLangOpts().getValueVisibilityMode()
734 : Context.getLangOpts().getTypeVisibilityMode();
735 LV.mergeVisibility(globalVisibility, /*explicit*/ false);
737 // If we're paying attention to global visibility, apply
738 // -finline-visibility-hidden if this is an inline method.
739 if (useInlineVisibilityHidden(D))
740 LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
744 // C++ [basic.link]p4:
746 // A name having namespace scope that has not been given internal linkage
747 // above and that is the name of
749 // has its linkage determined as follows:
750 // - if the enclosing namespace has internal linkage, the name has
751 // internal linkage; [handled above]
752 // - otherwise, if the declaration of the name is attached to a named
753 // module and is not exported, the name has module linkage;
754 // - otherwise, the name has external linkage.
755 // LV is currently set up to handle the last two bullets.
760 if (const auto *Var = dyn_cast<VarDecl>(D)) {
761 // GCC applies the following optimization to variables and static
762 // data members, but not to functions:
764 // Modify the variable's LV by the LV of its type unless this is
765 // C or extern "C". This follows from [basic.link]p9:
766 // A type without linkage shall not be used as the type of a
767 // variable or function with external linkage unless
768 // - the entity has C language linkage, or
769 // - the entity is declared within an unnamed namespace, or
770 // - the entity is not used or is defined in the same
772 // and [basic.link]p10:
773 // ...the types specified by all declarations referring to a
774 // given variable or function shall be identical...
775 // C does not have an equivalent rule.
777 // Ignore this if we've got an explicit attribute; the user
778 // probably knows what they're doing.
780 // Note that we don't want to make the variable non-external
781 // because of this, but unique-external linkage suits us.
782 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Var) &&
783 !IgnoreVarTypeLinkage) {
784 LinkageInfo TypeLV = getLVForType(*Var->getType(), computation);
785 if (!isExternallyVisible(TypeLV.getLinkage()))
786 return LinkageInfo::uniqueExternal();
787 if (!LV.isVisibilityExplicit())
788 LV.mergeVisibility(TypeLV);
791 if (Var->getStorageClass() == SC_PrivateExtern)
792 LV.mergeVisibility(HiddenVisibility, true);
794 // Note that Sema::MergeVarDecl already takes care of implementing
795 // C99 6.2.2p4 and propagating the visibility attribute, so we don't have
798 // As per function and class template specializations (below),
799 // consider LV for the template and template arguments. We're at file
800 // scope, so we do not need to worry about nested specializations.
801 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(Var)) {
802 mergeTemplateLV(LV, spec, computation);
806 } else if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
807 // In theory, we can modify the function's LV by the LV of its
808 // type unless it has C linkage (see comment above about variables
809 // for justification). In practice, GCC doesn't do this, so it's
810 // just too painful to make work.
812 if (Function->getStorageClass() == SC_PrivateExtern)
813 LV.mergeVisibility(HiddenVisibility, true);
815 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
816 // merging storage classes and visibility attributes, so we don't have to
817 // look at previous decls in here.
819 // In C++, then if the type of the function uses a type with
820 // unique-external linkage, it's not legally usable from outside
821 // this translation unit. However, we should use the C linkage
822 // rules instead for extern "C" declarations.
823 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Function)) {
824 // Only look at the type-as-written. Otherwise, deducing the return type
825 // of a function could change its linkage.
826 QualType TypeAsWritten = Function->getType();
827 if (TypeSourceInfo *TSI = Function->getTypeSourceInfo())
828 TypeAsWritten = TSI->getType();
829 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
830 return LinkageInfo::uniqueExternal();
833 // Consider LV from the template and the template arguments.
834 // We're at file scope, so we do not need to worry about nested
836 if (FunctionTemplateSpecializationInfo *specInfo
837 = Function->getTemplateSpecializationInfo()) {
838 mergeTemplateLV(LV, Function, specInfo, computation);
841 // - a named class (Clause 9), or an unnamed class defined in a
842 // typedef declaration in which the class has the typedef name
843 // for linkage purposes (7.1.3); or
844 // - a named enumeration (7.2), or an unnamed enumeration
845 // defined in a typedef declaration in which the enumeration
846 // has the typedef name for linkage purposes (7.1.3); or
847 } else if (const auto *Tag = dyn_cast<TagDecl>(D)) {
848 // Unnamed tags have no linkage.
849 if (!Tag->hasNameForLinkage())
850 return LinkageInfo::none();
852 // If this is a class template specialization, consider the
853 // linkage of the template and template arguments. We're at file
854 // scope, so we do not need to worry about nested specializations.
855 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) {
856 mergeTemplateLV(LV, spec, computation);
859 // FIXME: This is not part of the C++ standard any more.
860 // - an enumerator belonging to an enumeration with external linkage; or
861 } else if (isa<EnumConstantDecl>(D)) {
862 LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()),
864 if (!isExternalFormalLinkage(EnumLV.getLinkage()))
865 return LinkageInfo::none();
869 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
870 bool considerVisibility = !hasExplicitVisibilityAlready(computation);
872 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
873 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
875 // An unnamed namespace or a namespace declared directly or indirectly
876 // within an unnamed namespace has internal linkage. All other namespaces
877 // have external linkage.
879 // We handled names in anonymous namespaces above.
880 } else if (isa<NamespaceDecl>(D)) {
883 // By extension, we assign external linkage to Objective-C
885 } else if (isa<ObjCInterfaceDecl>(D)) {
888 } else if (auto *TD = dyn_cast<TypedefNameDecl>(D)) {
889 // A typedef declaration has linkage if it gives a type a name for
891 if (!TD->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
892 return LinkageInfo::none();
894 // Everything not covered here has no linkage.
896 return LinkageInfo::none();
899 // If we ended up with non-externally-visible linkage, visibility should
900 // always be default.
901 if (!isExternallyVisible(LV.getLinkage()))
902 return LinkageInfo(LV.getLinkage(), DefaultVisibility, false);
908 LinkageComputer::getLVForClassMember(const NamedDecl *D,
909 LVComputationKind computation,
910 bool IgnoreVarTypeLinkage) {
911 // Only certain class members have linkage. Note that fields don't
912 // really have linkage, but it's convenient to say they do for the
913 // purposes of calculating linkage of pointer-to-data-member
914 // template arguments.
916 // Templates also don't officially have linkage, but since we ignore
917 // the C++ standard and look at template arguments when determining
918 // linkage and visibility of a template specialization, we might hit
919 // a template template argument that way. If we do, we need to
920 // consider its linkage.
921 if (!(isa<CXXMethodDecl>(D) ||
924 isa<IndirectFieldDecl>(D) ||
926 isa<TemplateDecl>(D)))
927 return LinkageInfo::none();
931 // If we have an explicit visibility attribute, merge that in.
932 if (!hasExplicitVisibilityAlready(computation)) {
933 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation))
934 LV.mergeVisibility(*Vis, true);
935 // If we're paying attention to global visibility, apply
936 // -finline-visibility-hidden if this is an inline method.
938 // Note that we do this before merging information about
939 // the class visibility.
940 if (!LV.isVisibilityExplicit() && useInlineVisibilityHidden(D))
941 LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
944 // If this class member has an explicit visibility attribute, the only
945 // thing that can change its visibility is the template arguments, so
946 // only look for them when processing the class.
947 LVComputationKind classComputation = computation;
948 if (LV.isVisibilityExplicit())
949 classComputation = withExplicitVisibilityAlready(computation);
951 LinkageInfo classLV =
952 getLVForDecl(cast<RecordDecl>(D->getDeclContext()), classComputation);
953 // The member has the same linkage as the class. If that's not externally
954 // visible, we don't need to compute anything about the linkage.
955 // FIXME: If we're only computing linkage, can we bail out here?
956 if (!isExternallyVisible(classLV.getLinkage()))
960 // Otherwise, don't merge in classLV yet, because in certain cases
961 // we need to completely ignore the visibility from it.
963 // Specifically, if this decl exists and has an explicit attribute.
964 const NamedDecl *explicitSpecSuppressor = nullptr;
966 if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {
967 // Only look at the type-as-written. Otherwise, deducing the return type
968 // of a function could change its linkage.
969 QualType TypeAsWritten = MD->getType();
970 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
971 TypeAsWritten = TSI->getType();
972 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
973 return LinkageInfo::uniqueExternal();
975 // If this is a method template specialization, use the linkage for
976 // the template parameters and arguments.
977 if (FunctionTemplateSpecializationInfo *spec
978 = MD->getTemplateSpecializationInfo()) {
979 mergeTemplateLV(LV, MD, spec, computation);
980 if (spec->isExplicitSpecialization()) {
981 explicitSpecSuppressor = MD;
982 } else if (isExplicitMemberSpecialization(spec->getTemplate())) {
983 explicitSpecSuppressor = spec->getTemplate()->getTemplatedDecl();
985 } else if (isExplicitMemberSpecialization(MD)) {
986 explicitSpecSuppressor = MD;
989 } else if (const auto *RD = dyn_cast<CXXRecordDecl>(D)) {
990 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
991 mergeTemplateLV(LV, spec, computation);
992 if (spec->isExplicitSpecialization()) {
993 explicitSpecSuppressor = spec;
995 const ClassTemplateDecl *temp = spec->getSpecializedTemplate();
996 if (isExplicitMemberSpecialization(temp)) {
997 explicitSpecSuppressor = temp->getTemplatedDecl();
1000 } else if (isExplicitMemberSpecialization(RD)) {
1001 explicitSpecSuppressor = RD;
1004 // Static data members.
1005 } else if (const auto *VD = dyn_cast<VarDecl>(D)) {
1006 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(VD))
1007 mergeTemplateLV(LV, spec, computation);
1009 // Modify the variable's linkage by its type, but ignore the
1010 // type's visibility unless it's a definition.
1011 if (!IgnoreVarTypeLinkage) {
1012 LinkageInfo typeLV = getLVForType(*VD->getType(), computation);
1013 // FIXME: If the type's linkage is not externally visible, we can
1014 // give this static data member UniqueExternalLinkage.
1015 if (!LV.isVisibilityExplicit() && !classLV.isVisibilityExplicit())
1016 LV.mergeVisibility(typeLV);
1017 LV.mergeExternalVisibility(typeLV);
1020 if (isExplicitMemberSpecialization(VD)) {
1021 explicitSpecSuppressor = VD;
1024 // Template members.
1025 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
1026 bool considerVisibility =
1027 (!LV.isVisibilityExplicit() &&
1028 !classLV.isVisibilityExplicit() &&
1029 !hasExplicitVisibilityAlready(computation));
1030 LinkageInfo tempLV =
1031 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
1032 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
1034 if (const auto *redeclTemp = dyn_cast<RedeclarableTemplateDecl>(temp)) {
1035 if (isExplicitMemberSpecialization(redeclTemp)) {
1036 explicitSpecSuppressor = temp->getTemplatedDecl();
1041 // We should never be looking for an attribute directly on a template.
1042 assert(!explicitSpecSuppressor || !isa<TemplateDecl>(explicitSpecSuppressor));
1044 // If this member is an explicit member specialization, and it has
1045 // an explicit attribute, ignore visibility from the parent.
1046 bool considerClassVisibility = true;
1047 if (explicitSpecSuppressor &&
1048 // optimization: hasDVA() is true only with explicit visibility.
1049 LV.isVisibilityExplicit() &&
1050 classLV.getVisibility() != DefaultVisibility &&
1051 hasDirectVisibilityAttribute(explicitSpecSuppressor, computation)) {
1052 considerClassVisibility = false;
1055 // Finally, merge in information from the class.
1056 LV.mergeMaybeWithVisibility(classLV, considerClassVisibility);
1060 void NamedDecl::anchor() {}
1062 bool NamedDecl::isLinkageValid() const {
1063 if (!hasCachedLinkage())
1066 Linkage L = LinkageComputer{}
1067 .computeLVForDecl(this, LVComputationKind::forLinkageOnly())
1069 return L == getCachedLinkage();
1072 ObjCStringFormatFamily NamedDecl::getObjCFStringFormattingFamily() const {
1073 StringRef name = getName();
1074 if (name.empty()) return SFF_None;
1076 if (name.front() == 'C')
1077 if (name == "CFStringCreateWithFormat" ||
1078 name == "CFStringCreateWithFormatAndArguments" ||
1079 name == "CFStringAppendFormat" ||
1080 name == "CFStringAppendFormatAndArguments")
1081 return SFF_CFString;
1085 Linkage NamedDecl::getLinkageInternal() const {
1086 // We don't care about visibility here, so ask for the cheapest
1087 // possible visibility analysis.
1088 return LinkageComputer{}
1089 .getLVForDecl(this, LVComputationKind::forLinkageOnly())
1093 LinkageInfo NamedDecl::getLinkageAndVisibility() const {
1094 return LinkageComputer{}.getDeclLinkageAndVisibility(this);
1097 static Optional<Visibility>
1098 getExplicitVisibilityAux(const NamedDecl *ND,
1099 NamedDecl::ExplicitVisibilityKind kind,
1100 bool IsMostRecent) {
1101 assert(!IsMostRecent || ND == ND->getMostRecentDecl());
1103 // Check the declaration itself first.
1104 if (Optional<Visibility> V = getVisibilityOf(ND, kind))
1107 // If this is a member class of a specialization of a class template
1108 // and the corresponding decl has explicit visibility, use that.
1109 if (const auto *RD = dyn_cast<CXXRecordDecl>(ND)) {
1110 CXXRecordDecl *InstantiatedFrom = RD->getInstantiatedFromMemberClass();
1111 if (InstantiatedFrom)
1112 return getVisibilityOf(InstantiatedFrom, kind);
1115 // If there wasn't explicit visibility there, and this is a
1116 // specialization of a class template, check for visibility
1118 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
1119 // Walk all the template decl till this point to see if there are
1120 // explicit visibility attributes.
1121 const auto *TD = spec->getSpecializedTemplate()->getTemplatedDecl();
1122 while (TD != nullptr) {
1123 auto Vis = getVisibilityOf(TD, kind);
1126 TD = TD->getPreviousDecl();
1131 // Use the most recent declaration.
1132 if (!IsMostRecent && !isa<NamespaceDecl>(ND)) {
1133 const NamedDecl *MostRecent = ND->getMostRecentDecl();
1134 if (MostRecent != ND)
1135 return getExplicitVisibilityAux(MostRecent, kind, true);
1138 if (const auto *Var = dyn_cast<VarDecl>(ND)) {
1139 if (Var->isStaticDataMember()) {
1140 VarDecl *InstantiatedFrom = Var->getInstantiatedFromStaticDataMember();
1141 if (InstantiatedFrom)
1142 return getVisibilityOf(InstantiatedFrom, kind);
1145 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Var))
1146 return getVisibilityOf(VTSD->getSpecializedTemplate()->getTemplatedDecl(),
1151 // Also handle function template specializations.
1152 if (const auto *fn = dyn_cast<FunctionDecl>(ND)) {
1153 // If the function is a specialization of a template with an
1154 // explicit visibility attribute, use that.
1155 if (FunctionTemplateSpecializationInfo *templateInfo
1156 = fn->getTemplateSpecializationInfo())
1157 return getVisibilityOf(templateInfo->getTemplate()->getTemplatedDecl(),
1160 // If the function is a member of a specialization of a class template
1161 // and the corresponding decl has explicit visibility, use that.
1162 FunctionDecl *InstantiatedFrom = fn->getInstantiatedFromMemberFunction();
1163 if (InstantiatedFrom)
1164 return getVisibilityOf(InstantiatedFrom, kind);
1169 // The visibility of a template is stored in the templated decl.
1170 if (const auto *TD = dyn_cast<TemplateDecl>(ND))
1171 return getVisibilityOf(TD->getTemplatedDecl(), kind);
1176 Optional<Visibility>
1177 NamedDecl::getExplicitVisibility(ExplicitVisibilityKind kind) const {
1178 return getExplicitVisibilityAux(this, kind, false);
1181 LinkageInfo LinkageComputer::getLVForClosure(const DeclContext *DC,
1183 LVComputationKind computation) {
1184 // This lambda has its linkage/visibility determined by its owner.
1185 const NamedDecl *Owner;
1187 Owner = dyn_cast<NamedDecl>(DC);
1188 else if (isa<ParmVarDecl>(ContextDecl))
1190 dyn_cast<NamedDecl>(ContextDecl->getDeclContext()->getRedeclContext());
1192 Owner = cast<NamedDecl>(ContextDecl);
1195 return LinkageInfo::none();
1197 // If the owner has a deduced type, we need to skip querying the linkage and
1198 // visibility of that type, because it might involve this closure type. The
1199 // only effect of this is that we might give a lambda VisibleNoLinkage rather
1200 // than NoLinkage when we don't strictly need to, which is benign.
1201 auto *VD = dyn_cast<VarDecl>(Owner);
1202 LinkageInfo OwnerLV =
1203 VD && VD->getType()->getContainedDeducedType()
1204 ? computeLVForDecl(Owner, computation, /*IgnoreVarTypeLinkage*/true)
1205 : getLVForDecl(Owner, computation);
1207 // A lambda never formally has linkage. But if the owner is externally
1208 // visible, then the lambda is too. We apply the same rules to blocks.
1209 if (!isExternallyVisible(OwnerLV.getLinkage()))
1210 return LinkageInfo::none();
1211 return LinkageInfo(VisibleNoLinkage, OwnerLV.getVisibility(),
1212 OwnerLV.isVisibilityExplicit());
1215 LinkageInfo LinkageComputer::getLVForLocalDecl(const NamedDecl *D,
1216 LVComputationKind computation) {
1217 if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
1218 if (Function->isInAnonymousNamespace() &&
1219 !isFirstInExternCContext(Function))
1220 return getInternalLinkageFor(Function);
1222 // This is a "void f();" which got merged with a file static.
1223 if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
1224 return getInternalLinkageFor(Function);
1227 if (!hasExplicitVisibilityAlready(computation)) {
1228 if (Optional<Visibility> Vis =
1229 getExplicitVisibility(Function, computation))
1230 LV.mergeVisibility(*Vis, true);
1233 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
1234 // merging storage classes and visibility attributes, so we don't have to
1235 // look at previous decls in here.
1240 if (const auto *Var = dyn_cast<VarDecl>(D)) {
1241 if (Var->hasExternalStorage()) {
1242 if (Var->isInAnonymousNamespace() && !isFirstInExternCContext(Var))
1243 return getInternalLinkageFor(Var);
1246 if (Var->getStorageClass() == SC_PrivateExtern)
1247 LV.mergeVisibility(HiddenVisibility, true);
1248 else if (!hasExplicitVisibilityAlready(computation)) {
1249 if (Optional<Visibility> Vis = getExplicitVisibility(Var, computation))
1250 LV.mergeVisibility(*Vis, true);
1253 if (const VarDecl *Prev = Var->getPreviousDecl()) {
1254 LinkageInfo PrevLV = getLVForDecl(Prev, computation);
1255 if (PrevLV.getLinkage())
1256 LV.setLinkage(PrevLV.getLinkage());
1257 LV.mergeVisibility(PrevLV);
1263 if (!Var->isStaticLocal())
1264 return LinkageInfo::none();
1267 ASTContext &Context = D->getASTContext();
1268 if (!Context.getLangOpts().CPlusPlus)
1269 return LinkageInfo::none();
1271 const Decl *OuterD = getOutermostFuncOrBlockContext(D);
1272 if (!OuterD || OuterD->isInvalidDecl())
1273 return LinkageInfo::none();
1276 if (const auto *BD = dyn_cast<BlockDecl>(OuterD)) {
1277 if (!BD->getBlockManglingNumber())
1278 return LinkageInfo::none();
1280 LV = getLVForClosure(BD->getDeclContext()->getRedeclContext(),
1281 BD->getBlockManglingContextDecl(), computation);
1283 const auto *FD = cast<FunctionDecl>(OuterD);
1284 if (!FD->isInlined() &&
1285 !isTemplateInstantiation(FD->getTemplateSpecializationKind()))
1286 return LinkageInfo::none();
1288 // If a function is hidden by -fvisibility-inlines-hidden option and
1289 // is not explicitly attributed as a hidden function,
1290 // we should not make static local variables in the function hidden.
1291 LV = getLVForDecl(FD, computation);
1292 if (isa<VarDecl>(D) && useInlineVisibilityHidden(FD) &&
1293 !LV.isVisibilityExplicit()) {
1294 assert(cast<VarDecl>(D)->isStaticLocal());
1295 // If this was an implicitly hidden inline method, check again for
1296 // explicit visibility on the parent class, and use that for static locals
1298 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1299 LV = getLVForDecl(MD->getParent(), computation);
1300 if (!LV.isVisibilityExplicit()) {
1301 Visibility globalVisibility =
1302 computation.isValueVisibility()
1303 ? Context.getLangOpts().getValueVisibilityMode()
1304 : Context.getLangOpts().getTypeVisibilityMode();
1305 return LinkageInfo(VisibleNoLinkage, globalVisibility,
1306 /*visibilityExplicit=*/false);
1310 if (!isExternallyVisible(LV.getLinkage()))
1311 return LinkageInfo::none();
1312 return LinkageInfo(VisibleNoLinkage, LV.getVisibility(),
1313 LV.isVisibilityExplicit());
1316 static inline const CXXRecordDecl*
1317 getOutermostEnclosingLambda(const CXXRecordDecl *Record) {
1318 const CXXRecordDecl *Ret = Record;
1319 while (Record && Record->isLambda()) {
1321 if (!Record->getParent()) break;
1322 // Get the Containing Class of this Lambda Class
1323 Record = dyn_cast_or_null<CXXRecordDecl>(
1324 Record->getParent()->getParent());
1329 LinkageInfo LinkageComputer::computeLVForDecl(const NamedDecl *D,
1330 LVComputationKind computation,
1331 bool IgnoreVarTypeLinkage) {
1332 // Internal_linkage attribute overrides other considerations.
1333 if (D->hasAttr<InternalLinkageAttr>())
1334 return getInternalLinkageFor(D);
1336 // Objective-C: treat all Objective-C declarations as having external
1338 switch (D->getKind()) {
1342 // Per C++ [basic.link]p2, only the names of objects, references,
1343 // functions, types, templates, namespaces, and values ever have linkage.
1345 // Note that the name of a typedef, namespace alias, using declaration,
1346 // and so on are not the name of the corresponding type, namespace, or
1347 // declaration, so they do *not* have linkage.
1348 case Decl::ImplicitParam:
1350 case Decl::NamespaceAlias:
1353 case Decl::UsingShadow:
1354 case Decl::UsingDirective:
1355 return LinkageInfo::none();
1357 case Decl::EnumConstant:
1358 // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
1359 if (D->getASTContext().getLangOpts().CPlusPlus)
1360 return getLVForDecl(cast<EnumDecl>(D->getDeclContext()), computation);
1361 return LinkageInfo::visible_none();
1364 case Decl::TypeAlias:
1365 // A typedef declaration has linkage if it gives a type a name for
1366 // linkage purposes.
1367 if (!cast<TypedefNameDecl>(D)
1368 ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
1369 return LinkageInfo::none();
1372 case Decl::TemplateTemplateParm: // count these as external
1373 case Decl::NonTypeTemplateParm:
1374 case Decl::ObjCAtDefsField:
1375 case Decl::ObjCCategory:
1376 case Decl::ObjCCategoryImpl:
1377 case Decl::ObjCCompatibleAlias:
1378 case Decl::ObjCImplementation:
1379 case Decl::ObjCMethod:
1380 case Decl::ObjCProperty:
1381 case Decl::ObjCPropertyImpl:
1382 case Decl::ObjCProtocol:
1383 return getExternalLinkageFor(D);
1385 case Decl::CXXRecord: {
1386 const auto *Record = cast<CXXRecordDecl>(D);
1387 if (Record->isLambda()) {
1388 if (!Record->getLambdaManglingNumber()) {
1389 // This lambda has no mangling number, so it's internal.
1390 return getInternalLinkageFor(D);
1393 // This lambda has its linkage/visibility determined:
1394 // - either by the outermost lambda if that lambda has no mangling
1396 // - or by the parent of the outer most lambda
1397 // This prevents infinite recursion in settings such as nested lambdas
1398 // used in NSDMI's, for e.g.
1401 // int t2 = ([](int a) { return [](int b) { return b; };})(t)(t);
1403 const CXXRecordDecl *OuterMostLambda =
1404 getOutermostEnclosingLambda(Record);
1405 if (!OuterMostLambda->getLambdaManglingNumber())
1406 return getInternalLinkageFor(D);
1408 return getLVForClosure(
1409 OuterMostLambda->getDeclContext()->getRedeclContext(),
1410 OuterMostLambda->getLambdaContextDecl(), computation);
1417 // Handle linkage for namespace-scope names.
1418 if (D->getDeclContext()->getRedeclContext()->isFileContext())
1419 return getLVForNamespaceScopeDecl(D, computation, IgnoreVarTypeLinkage);
1421 // C++ [basic.link]p5:
1422 // In addition, a member function, static data member, a named
1423 // class or enumeration of class scope, or an unnamed class or
1424 // enumeration defined in a class-scope typedef declaration such
1425 // that the class or enumeration has the typedef name for linkage
1426 // purposes (7.1.3), has external linkage if the name of the class
1427 // has external linkage.
1428 if (D->getDeclContext()->isRecord())
1429 return getLVForClassMember(D, computation, IgnoreVarTypeLinkage);
1431 // C++ [basic.link]p6:
1432 // The name of a function declared in block scope and the name of
1433 // an object declared by a block scope extern declaration have
1434 // linkage. If there is a visible declaration of an entity with
1435 // linkage having the same name and type, ignoring entities
1436 // declared outside the innermost enclosing namespace scope, the
1437 // block scope declaration declares that same entity and receives
1438 // the linkage of the previous declaration. If there is more than
1439 // one such matching entity, the program is ill-formed. Otherwise,
1440 // if no matching entity is found, the block scope entity receives
1441 // external linkage.
1442 if (D->getDeclContext()->isFunctionOrMethod())
1443 return getLVForLocalDecl(D, computation);
1445 // C++ [basic.link]p6:
1446 // Names not covered by these rules have no linkage.
1447 return LinkageInfo::none();
1450 /// getLVForDecl - Get the linkage and visibility for the given declaration.
1451 LinkageInfo LinkageComputer::getLVForDecl(const NamedDecl *D,
1452 LVComputationKind computation) {
1453 // Internal_linkage attribute overrides other considerations.
1454 if (D->hasAttr<InternalLinkageAttr>())
1455 return getInternalLinkageFor(D);
1457 if (computation.IgnoreAllVisibility && D->hasCachedLinkage())
1458 return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);
1460 if (llvm::Optional<LinkageInfo> LI = lookup(D, computation))
1463 LinkageInfo LV = computeLVForDecl(D, computation);
1464 if (D->hasCachedLinkage())
1465 assert(D->getCachedLinkage() == LV.getLinkage());
1467 D->setCachedLinkage(LV.getLinkage());
1468 cache(D, computation, LV);
1471 // In C (because of gnu inline) and in c++ with microsoft extensions an
1472 // static can follow an extern, so we can have two decls with different
1474 const LangOptions &Opts = D->getASTContext().getLangOpts();
1475 if (!Opts.CPlusPlus || Opts.MicrosoftExt)
1478 // We have just computed the linkage for this decl. By induction we know
1479 // that all other computed linkages match, check that the one we just
1480 // computed also does.
1481 NamedDecl *Old = nullptr;
1482 for (auto I : D->redecls()) {
1483 auto *T = cast<NamedDecl>(I);
1486 if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
1491 assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage());
1497 LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
1498 return getLVForDecl(D,
1499 LVComputationKind(usesTypeVisibility(D)
1500 ? NamedDecl::VisibilityForType
1501 : NamedDecl::VisibilityForValue));
1504 Module *Decl::getOwningModuleForLinkage(bool IgnoreLinkage) const {
1505 Module *M = getOwningModule();
1510 case Module::ModuleMapModule:
1511 // Module map modules have no special linkage semantics.
1514 case Module::ModuleInterfaceUnit:
1517 case Module::GlobalModuleFragment: {
1518 // External linkage declarations in the global module have no owning module
1519 // for linkage purposes. But internal linkage declarations in the global
1520 // module fragment of a particular module are owned by that module for
1521 // linkage purposes.
1524 bool InternalLinkage;
1525 if (auto *ND = dyn_cast<NamedDecl>(this))
1526 InternalLinkage = !ND->hasExternalFormalLinkage();
1528 auto *NSD = dyn_cast<NamespaceDecl>(this);
1529 InternalLinkage = (NSD && NSD->isAnonymousNamespace()) ||
1530 isInAnonymousNamespace();
1532 return InternalLinkage ? M->Parent : nullptr;
1535 case Module::PrivateModuleFragment:
1536 // The private module fragment is part of its containing module for linkage
1541 llvm_unreachable("unknown module kind");
1544 void NamedDecl::printName(raw_ostream &os) const {
1548 std::string NamedDecl::getQualifiedNameAsString() const {
1549 std::string QualName;
1550 llvm::raw_string_ostream OS(QualName);
1551 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1555 void NamedDecl::printQualifiedName(raw_ostream &OS) const {
1556 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1559 void NamedDecl::printQualifiedName(raw_ostream &OS,
1560 const PrintingPolicy &P) const {
1561 const DeclContext *Ctx = getDeclContext();
1563 // For ObjC methods and properties, look through categories and use the
1564 // interface as context.
1565 if (auto *MD = dyn_cast<ObjCMethodDecl>(this))
1566 if (auto *ID = MD->getClassInterface())
1568 if (auto *PD = dyn_cast<ObjCPropertyDecl>(this)) {
1569 if (auto *MD = PD->getGetterMethodDecl())
1570 if (auto *ID = MD->getClassInterface())
1574 if (Ctx->isFunctionOrMethod()) {
1579 using ContextsTy = SmallVector<const DeclContext *, 8>;
1580 ContextsTy Contexts;
1582 // Collect named contexts.
1584 if (isa<NamedDecl>(Ctx))
1585 Contexts.push_back(Ctx);
1586 Ctx = Ctx->getParent();
1589 for (const DeclContext *DC : llvm::reverse(Contexts)) {
1590 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
1591 OS << Spec->getName();
1592 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1593 printTemplateArgumentList(OS, TemplateArgs.asArray(), P);
1594 } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
1595 if (P.SuppressUnwrittenScope &&
1596 (ND->isAnonymousNamespace() || ND->isInline()))
1598 if (ND->isAnonymousNamespace()) {
1599 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1600 : "(anonymous namespace)");
1604 } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
1605 if (!RD->getIdentifier())
1606 OS << "(anonymous " << RD->getKindName() << ')';
1609 } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
1610 const FunctionProtoType *FT = nullptr;
1611 if (FD->hasWrittenPrototype())
1612 FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
1616 unsigned NumParams = FD->getNumParams();
1617 for (unsigned i = 0; i < NumParams; ++i) {
1620 OS << FD->getParamDecl(i)->getType().stream(P);
1623 if (FT->isVariadic()) {
1630 } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
1631 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1632 // enumerator is declared in the scope that immediately contains
1633 // the enum-specifier. Each scoped enumerator is declared in the
1634 // scope of the enumeration.
1635 // For the case of unscoped enumerator, do not include in the qualified
1636 // name any information about its enum enclosing scope, as its visibility
1643 OS << *cast<NamedDecl>(DC);
1648 if (getDeclName() || isa<DecompositionDecl>(this))
1651 OS << "(anonymous)";
1654 void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1655 const PrintingPolicy &Policy,
1656 bool Qualified) const {
1658 printQualifiedName(OS, Policy);
1663 template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1666 static bool isRedeclarableImpl(...) { return false; }
1667 static bool isRedeclarable(Decl::Kind K) {
1669 #define DECL(Type, Base) \
1671 return isRedeclarableImpl((Type##Decl *)nullptr);
1672 #define ABSTRACT_DECL(DECL)
1673 #include "clang/AST/DeclNodes.inc"
1675 llvm_unreachable("unknown decl kind");
1678 bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
1679 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
1681 // Never replace one imported declaration with another; we need both results
1682 // when re-exporting.
1683 if (OldD->isFromASTFile() && isFromASTFile())
1686 // A kind mismatch implies that the declaration is not replaced.
1687 if (OldD->getKind() != getKind())
1690 // For method declarations, we never replace. (Why?)
1691 if (isa<ObjCMethodDecl>(this))
1694 // For parameters, pick the newer one. This is either an error or (in
1695 // Objective-C) permitted as an extension.
1696 if (isa<ParmVarDecl>(this))
1699 // Inline namespaces can give us two declarations with the same
1700 // name and kind in the same scope but different contexts; we should
1701 // keep both declarations in this case.
1702 if (!this->getDeclContext()->getRedeclContext()->Equals(
1703 OldD->getDeclContext()->getRedeclContext()))
1706 // Using declarations can be replaced if they import the same name from the
1708 if (auto *UD = dyn_cast<UsingDecl>(this)) {
1709 ASTContext &Context = getASTContext();
1710 return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
1711 Context.getCanonicalNestedNameSpecifier(
1712 cast<UsingDecl>(OldD)->getQualifier());
1714 if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
1715 ASTContext &Context = getASTContext();
1716 return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
1717 Context.getCanonicalNestedNameSpecifier(
1718 cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
1721 if (isRedeclarable(getKind())) {
1722 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1728 // Check whether this is actually newer than OldD. We want to keep the
1729 // newer declaration. This loop will usually only iterate once, because
1730 // OldD is usually the previous declaration.
1731 for (auto D : redecls()) {
1735 // If we reach the canonical declaration, then OldD is not actually older
1738 // FIXME: In this case, we should not add this decl to the lookup table.
1739 if (D->isCanonicalDecl())
1743 // It's a newer declaration of the same kind of declaration in the same
1744 // scope: we want this decl instead of the existing one.
1748 // In all other cases, we need to keep both declarations in case they have
1749 // different visibility. Any attempt to use the name will result in an
1750 // ambiguity if more than one is visible.
1754 bool NamedDecl::hasLinkage() const {
1755 return getFormalLinkage() != NoLinkage;
1758 NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1759 NamedDecl *ND = this;
1760 while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
1761 ND = UD->getTargetDecl();
1763 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
1764 return AD->getClassInterface();
1766 if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
1767 return AD->getNamespace();
1772 bool NamedDecl::isCXXInstanceMember() const {
1773 if (!isCXXClassMember())
1776 const NamedDecl *D = this;
1777 if (isa<UsingShadowDecl>(D))
1778 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1780 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
1782 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
1783 return MD->isInstance();
1787 //===----------------------------------------------------------------------===//
1788 // DeclaratorDecl Implementation
1789 //===----------------------------------------------------------------------===//
1791 template <typename DeclT>
1792 static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1793 if (decl->getNumTemplateParameterLists() > 0)
1794 return decl->getTemplateParameterList(0)->getTemplateLoc();
1796 return decl->getInnerLocStart();
1799 SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1800 TypeSourceInfo *TSI = getTypeSourceInfo();
1801 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1802 return SourceLocation();
1805 void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1807 // Make sure the extended decl info is allocated.
1808 if (!hasExtInfo()) {
1809 // Save (non-extended) type source info pointer.
1810 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1811 // Allocate external info struct.
1812 DeclInfo = new (getASTContext()) ExtInfo;
1813 // Restore savedTInfo into (extended) decl info.
1814 getExtInfo()->TInfo = savedTInfo;
1816 // Set qualifier info.
1817 getExtInfo()->QualifierLoc = QualifierLoc;
1819 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1821 if (getExtInfo()->NumTemplParamLists == 0) {
1822 // Save type source info pointer.
1823 TypeSourceInfo *savedTInfo = getExtInfo()->TInfo;
1824 // Deallocate the extended decl info.
1825 getASTContext().Deallocate(getExtInfo());
1826 // Restore savedTInfo into (non-extended) decl info.
1827 DeclInfo = savedTInfo;
1830 getExtInfo()->QualifierLoc = QualifierLoc;
1835 void DeclaratorDecl::setTemplateParameterListsInfo(
1836 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1837 assert(!TPLists.empty());
1838 // Make sure the extended decl info is allocated.
1839 if (!hasExtInfo()) {
1840 // Save (non-extended) type source info pointer.
1841 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1842 // Allocate external info struct.
1843 DeclInfo = new (getASTContext()) ExtInfo;
1844 // Restore savedTInfo into (extended) decl info.
1845 getExtInfo()->TInfo = savedTInfo;
1847 // Set the template parameter lists info.
1848 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1851 SourceLocation DeclaratorDecl::getOuterLocStart() const {
1852 return getTemplateOrInnerLocStart(this);
1855 // Helper function: returns true if QT is or contains a type
1856 // having a postfix component.
1857 static bool typeIsPostfix(QualType QT) {
1859 const Type* T = QT.getTypePtr();
1860 switch (T->getTypeClass()) {
1864 QT = cast<PointerType>(T)->getPointeeType();
1866 case Type::BlockPointer:
1867 QT = cast<BlockPointerType>(T)->getPointeeType();
1869 case Type::MemberPointer:
1870 QT = cast<MemberPointerType>(T)->getPointeeType();
1872 case Type::LValueReference:
1873 case Type::RValueReference:
1874 QT = cast<ReferenceType>(T)->getPointeeType();
1876 case Type::PackExpansion:
1877 QT = cast<PackExpansionType>(T)->getPattern();
1880 case Type::ConstantArray:
1881 case Type::DependentSizedArray:
1882 case Type::IncompleteArray:
1883 case Type::VariableArray:
1884 case Type::FunctionProto:
1885 case Type::FunctionNoProto:
1891 SourceRange DeclaratorDecl::getSourceRange() const {
1892 SourceLocation RangeEnd = getLocation();
1893 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
1894 // If the declaration has no name or the type extends past the name take the
1895 // end location of the type.
1896 if (!getDeclName() || typeIsPostfix(TInfo->getType()))
1897 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
1899 return SourceRange(getOuterLocStart(), RangeEnd);
1902 void QualifierInfo::setTemplateParameterListsInfo(
1903 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1904 // Free previous template parameters (if any).
1905 if (NumTemplParamLists > 0) {
1906 Context.Deallocate(TemplParamLists);
1907 TemplParamLists = nullptr;
1908 NumTemplParamLists = 0;
1910 // Set info on matched template parameter lists (if any).
1911 if (!TPLists.empty()) {
1912 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
1913 NumTemplParamLists = TPLists.size();
1914 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
1918 //===----------------------------------------------------------------------===//
1919 // VarDecl Implementation
1920 //===----------------------------------------------------------------------===//
1922 const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
1924 case SC_None: break;
1925 case SC_Auto: return "auto";
1926 case SC_Extern: return "extern";
1927 case SC_PrivateExtern: return "__private_extern__";
1928 case SC_Register: return "register";
1929 case SC_Static: return "static";
1932 llvm_unreachable("Invalid storage class");
1935 VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
1936 SourceLocation StartLoc, SourceLocation IdLoc,
1937 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1939 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
1940 redeclarable_base(C) {
1941 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
1942 "VarDeclBitfields too large!");
1943 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
1944 "ParmVarDeclBitfields too large!");
1945 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
1946 "NonParmVarDeclBitfields too large!");
1948 VarDeclBits.SClass = SC;
1949 // Everything else is implicitly initialized to false.
1952 VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC,
1953 SourceLocation StartL, SourceLocation IdL,
1954 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1956 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
1959 VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
1961 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
1962 QualType(), nullptr, SC_None);
1965 void VarDecl::setStorageClass(StorageClass SC) {
1966 assert(isLegalForVariable(SC));
1967 VarDeclBits.SClass = SC;
1970 VarDecl::TLSKind VarDecl::getTLSKind() const {
1971 switch (VarDeclBits.TSCSpec) {
1972 case TSCS_unspecified:
1973 if (!hasAttr<ThreadAttr>() &&
1974 !(getASTContext().getLangOpts().OpenMPUseTLS &&
1975 getASTContext().getTargetInfo().isTLSSupported() &&
1976 hasAttr<OMPThreadPrivateDeclAttr>()))
1978 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
1979 LangOptions::MSVC2015)) ||
1980 hasAttr<OMPThreadPrivateDeclAttr>())
1983 case TSCS___thread: // Fall through.
1984 case TSCS__Thread_local:
1986 case TSCS_thread_local:
1989 llvm_unreachable("Unknown thread storage class specifier!");
1992 SourceRange VarDecl::getSourceRange() const {
1993 if (const Expr *Init = getInit()) {
1994 SourceLocation InitEnd = Init->getEndLoc();
1995 // If Init is implicit, ignore its source range and fallback on
1996 // DeclaratorDecl::getSourceRange() to handle postfix elements.
1997 if (InitEnd.isValid() && InitEnd != getLocation())
1998 return SourceRange(getOuterLocStart(), InitEnd);
2000 return DeclaratorDecl::getSourceRange();
2003 template<typename T>
2004 static LanguageLinkage getDeclLanguageLinkage(const T &D) {
2005 // C++ [dcl.link]p1: All function types, function names with external linkage,
2006 // and variable names with external linkage have a language linkage.
2007 if (!D.hasExternalFormalLinkage())
2008 return NoLanguageLinkage;
2010 // Language linkage is a C++ concept, but saying that everything else in C has
2011 // C language linkage fits the implementation nicely.
2012 ASTContext &Context = D.getASTContext();
2013 if (!Context.getLangOpts().CPlusPlus)
2014 return CLanguageLinkage;
2016 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
2017 // language linkage of the names of class members and the function type of
2018 // class member functions.
2019 const DeclContext *DC = D.getDeclContext();
2021 return CXXLanguageLinkage;
2023 // If the first decl is in an extern "C" context, any other redeclaration
2024 // will have C language linkage. If the first one is not in an extern "C"
2025 // context, we would have reported an error for any other decl being in one.
2026 if (isFirstInExternCContext(&D))
2027 return CLanguageLinkage;
2028 return CXXLanguageLinkage;
2031 template<typename T>
2032 static bool isDeclExternC(const T &D) {
2033 // Since the context is ignored for class members, they can only have C++
2034 // language linkage or no language linkage.
2035 const DeclContext *DC = D.getDeclContext();
2036 if (DC->isRecord()) {
2037 assert(D.getASTContext().getLangOpts().CPlusPlus);
2041 return D.getLanguageLinkage() == CLanguageLinkage;
2044 LanguageLinkage VarDecl::getLanguageLinkage() const {
2045 return getDeclLanguageLinkage(*this);
2048 bool VarDecl::isExternC() const {
2049 return isDeclExternC(*this);
2052 bool VarDecl::isInExternCContext() const {
2053 return getLexicalDeclContext()->isExternCContext();
2056 bool VarDecl::isInExternCXXContext() const {
2057 return getLexicalDeclContext()->isExternCXXContext();
2060 VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
2062 VarDecl::DefinitionKind
2063 VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
2064 if (isThisDeclarationADemotedDefinition())
2065 return DeclarationOnly;
2067 // C++ [basic.def]p2:
2068 // A declaration is a definition unless [...] it contains the 'extern'
2069 // specifier or a linkage-specification and neither an initializer [...],
2070 // it declares a non-inline static data member in a class declaration [...],
2071 // it declares a static data member outside a class definition and the variable
2072 // was defined within the class with the constexpr specifier [...],
2073 // C++1y [temp.expl.spec]p15:
2074 // An explicit specialization of a static data member or an explicit
2075 // specialization of a static data member template is a definition if the
2076 // declaration includes an initializer; otherwise, it is a declaration.
2078 // FIXME: How do you declare (but not define) a partial specialization of
2079 // a static data member template outside the containing class?
2080 if (isStaticDataMember()) {
2081 if (isOutOfLine() &&
2082 !(getCanonicalDecl()->isInline() &&
2083 getCanonicalDecl()->isConstexpr()) &&
2085 // If the first declaration is out-of-line, this may be an
2086 // instantiation of an out-of-line partial specialization of a variable
2087 // template for which we have not yet instantiated the initializer.
2088 (getFirstDecl()->isOutOfLine()
2089 ? getTemplateSpecializationKind() == TSK_Undeclared
2090 : getTemplateSpecializationKind() !=
2091 TSK_ExplicitSpecialization) ||
2092 isa<VarTemplatePartialSpecializationDecl>(this)))
2094 else if (!isOutOfLine() && isInline())
2097 return DeclarationOnly;
2100 // A definition of an identifier is a declaration for that identifier that
2101 // [...] causes storage to be reserved for that object.
2102 // Note: that applies for all non-file-scope objects.
2104 // If the declaration of an identifier for an object has file scope and an
2105 // initializer, the declaration is an external definition for the identifier
2109 if (hasDefiningAttr())
2112 if (const auto *SAA = getAttr<SelectAnyAttr>())
2113 if (!SAA->isInherited())
2116 // A variable template specialization (other than a static data member
2117 // template or an explicit specialization) is a declaration until we
2118 // instantiate its initializer.
2119 if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2120 if (VTSD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
2121 !isa<VarTemplatePartialSpecializationDecl>(VTSD) &&
2122 !VTSD->IsCompleteDefinition)
2123 return DeclarationOnly;
2126 if (hasExternalStorage())
2127 return DeclarationOnly;
2130 // A declaration directly contained in a linkage-specification is treated
2131 // as if it contains the extern specifier for the purpose of determining
2132 // the linkage of the declared name and whether it is a definition.
2133 if (isSingleLineLanguageLinkage(*this))
2134 return DeclarationOnly;
2137 // A declaration of an object that has file scope without an initializer,
2138 // and without a storage class specifier or the scs 'static', constitutes
2139 // a tentative definition.
2140 // No such thing in C++.
2141 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
2142 return TentativeDefinition;
2144 // What's left is (in C, block-scope) declarations without initializers or
2145 // external storage. These are definitions.
2149 VarDecl *VarDecl::getActingDefinition() {
2150 DefinitionKind Kind = isThisDeclarationADefinition();
2151 if (Kind != TentativeDefinition)
2154 VarDecl *LastTentative = nullptr;
2155 VarDecl *First = getFirstDecl();
2156 for (auto I : First->redecls()) {
2157 Kind = I->isThisDeclarationADefinition();
2158 if (Kind == Definition)
2160 else if (Kind == TentativeDefinition)
2163 return LastTentative;
2166 VarDecl *VarDecl::getDefinition(ASTContext &C) {
2167 VarDecl *First = getFirstDecl();
2168 for (auto I : First->redecls()) {
2169 if (I->isThisDeclarationADefinition(C) == Definition)
2175 VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2176 DefinitionKind Kind = DeclarationOnly;
2178 const VarDecl *First = getFirstDecl();
2179 for (auto I : First->redecls()) {
2180 Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
2181 if (Kind == Definition)
2188 const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2189 for (auto I : redecls()) {
2190 if (auto Expr = I->getInit()) {
2198 bool VarDecl::hasInit() const {
2199 if (auto *P = dyn_cast<ParmVarDecl>(this))
2200 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2203 return !Init.isNull();
2206 Expr *VarDecl::getInit() {
2210 if (auto *S = Init.dyn_cast<Stmt *>())
2211 return cast<Expr>(S);
2213 return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2216 Stmt **VarDecl::getInitAddress() {
2217 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2220 return Init.getAddrOfPtr1();
2223 bool VarDecl::isOutOfLine() const {
2224 if (Decl::isOutOfLine())
2227 if (!isStaticDataMember())
2230 // If this static data member was instantiated from a static data member of
2231 // a class template, check whether that static data member was defined
2233 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2234 return VD->isOutOfLine();
2239 void VarDecl::setInit(Expr *I) {
2240 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2241 Eval->~EvaluatedStmt();
2242 getASTContext().Deallocate(Eval);
2248 bool VarDecl::mightBeUsableInConstantExpressions(ASTContext &C) const {
2249 const LangOptions &Lang = C.getLangOpts();
2251 if (!Lang.CPlusPlus)
2254 // Function parameters are never usable in constant expressions.
2255 if (isa<ParmVarDecl>(this))
2258 // In C++11, any variable of reference type can be used in a constant
2259 // expression if it is initialized by a constant expression.
2260 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2263 // Only const objects can be used in constant expressions in C++. C++98 does
2264 // not require the variable to be non-volatile, but we consider this to be a
2266 if (!getType().isConstQualified() || getType().isVolatileQualified())
2269 // In C++, const, non-volatile variables of integral or enumeration types
2270 // can be used in constant expressions.
2271 if (getType()->isIntegralOrEnumerationType())
2274 // Additionally, in C++11, non-volatile constexpr variables can be used in
2275 // constant expressions.
2276 return Lang.CPlusPlus11 && isConstexpr();
2279 bool VarDecl::isUsableInConstantExpressions(ASTContext &Context) const {
2280 // C++2a [expr.const]p3:
2281 // A variable is usable in constant expressions after its initializing
2282 // declaration is encountered...
2283 const VarDecl *DefVD = nullptr;
2284 const Expr *Init = getAnyInitializer(DefVD);
2285 if (!Init || Init->isValueDependent() || getType()->isDependentType())
2287 // ... if it is a constexpr variable, or it is of reference type or of
2288 // const-qualified integral or enumeration type, ...
2289 if (!DefVD->mightBeUsableInConstantExpressions(Context))
2291 // ... and its initializer is a constant initializer.
2292 return DefVD->checkInitIsICE();
2295 /// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2296 /// form, which contains extra information on the evaluated value of the
2298 EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2299 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2301 // Note: EvaluatedStmt contains an APValue, which usually holds
2302 // resources not allocated from the ASTContext. We need to do some
2303 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2304 // where we can detect whether there's anything to clean up or not.
2305 Eval = new (getASTContext()) EvaluatedStmt;
2306 Eval->Value = Init.get<Stmt *>();
2312 APValue *VarDecl::evaluateValue() const {
2313 SmallVector<PartialDiagnosticAt, 8> Notes;
2314 return evaluateValue(Notes);
2317 APValue *VarDecl::evaluateValue(
2318 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2319 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2321 // We only produce notes indicating why an initializer is non-constant the
2322 // first time it is evaluated. FIXME: The notes won't always be emitted the
2323 // first time we try evaluation, so might not be produced at all.
2324 if (Eval->WasEvaluated)
2325 return Eval->Evaluated.isAbsent() ? nullptr : &Eval->Evaluated;
2327 const auto *Init = cast<Expr>(Eval->Value);
2328 assert(!Init->isValueDependent());
2330 if (Eval->IsEvaluating) {
2331 // FIXME: Produce a diagnostic for self-initialization.
2332 Eval->CheckedICE = true;
2333 Eval->IsICE = false;
2337 Eval->IsEvaluating = true;
2339 bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, getASTContext(),
2342 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2343 // or that it's empty (so that there's nothing to clean up) if evaluation
2346 Eval->Evaluated = APValue();
2347 else if (Eval->Evaluated.needsCleanup())
2348 getASTContext().addDestruction(&Eval->Evaluated);
2350 Eval->IsEvaluating = false;
2351 Eval->WasEvaluated = true;
2353 // In C++11, we have determined whether the initializer was a constant
2354 // expression as a side-effect.
2355 if (getASTContext().getLangOpts().CPlusPlus11 && !Eval->CheckedICE) {
2356 Eval->CheckedICE = true;
2357 Eval->IsICE = Result && Notes.empty();
2360 return Result ? &Eval->Evaluated : nullptr;
2363 APValue *VarDecl::getEvaluatedValue() const {
2364 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2365 if (Eval->WasEvaluated)
2366 return &Eval->Evaluated;
2371 bool VarDecl::isInitKnownICE() const {
2372 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2373 return Eval->CheckedICE;
2378 bool VarDecl::isInitICE() const {
2379 assert(isInitKnownICE() &&
2380 "Check whether we already know that the initializer is an ICE");
2381 return Init.get<EvaluatedStmt *>()->IsICE;
2384 bool VarDecl::checkInitIsICE() const {
2385 // Initializers of weak variables are never ICEs.
2389 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2390 if (Eval->CheckedICE)
2391 // We have already checked whether this subexpression is an
2392 // integral constant expression.
2395 const auto *Init = cast<Expr>(Eval->Value);
2396 assert(!Init->isValueDependent());
2398 // In C++11, evaluate the initializer to check whether it's a constant
2400 if (getASTContext().getLangOpts().CPlusPlus11) {
2401 SmallVector<PartialDiagnosticAt, 8> Notes;
2402 evaluateValue(Notes);
2406 // It's an ICE whether or not the definition we found is
2407 // out-of-line. See DR 721 and the discussion in Clang PR
2408 // 6206 for details.
2410 if (Eval->CheckingICE)
2412 Eval->CheckingICE = true;
2414 Eval->IsICE = Init->isIntegerConstantExpr(getASTContext());
2415 Eval->CheckingICE = false;
2416 Eval->CheckedICE = true;
2420 bool VarDecl::isParameterPack() const {
2421 return isa<PackExpansionType>(getType());
2424 template<typename DeclT>
2425 static DeclT *getDefinitionOrSelf(DeclT *D) {
2427 if (auto *Def = D->getDefinition())
2432 bool VarDecl::isEscapingByref() const {
2433 return hasAttr<BlocksAttr>() && NonParmVarDeclBits.EscapingByref;
2436 bool VarDecl::isNonEscapingByref() const {
2437 return hasAttr<BlocksAttr>() && !NonParmVarDeclBits.EscapingByref;
2440 VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2441 const VarDecl *VD = this;
2443 // If this is an instantiated member, walk back to the template from which
2444 // it was instantiated.
2445 if (MemberSpecializationInfo *MSInfo = VD->getMemberSpecializationInfo()) {
2446 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
2447 VD = VD->getInstantiatedFromStaticDataMember();
2448 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2453 // If it's an instantiated variable template specialization, find the
2454 // template or partial specialization from which it was instantiated.
2455 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
2456 if (isTemplateInstantiation(VDTemplSpec->getTemplateSpecializationKind())) {
2457 auto From = VDTemplSpec->getInstantiatedFrom();
2458 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2459 while (!VTD->isMemberSpecialization()) {
2460 auto *NewVTD = VTD->getInstantiatedFromMemberTemplate();
2465 return getDefinitionOrSelf(VTD->getTemplatedDecl());
2468 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2469 while (!VTPSD->isMemberSpecialization()) {
2470 auto *NewVTPSD = VTPSD->getInstantiatedFromMember();
2475 return getDefinitionOrSelf<VarDecl>(VTPSD);
2480 // If this is the pattern of a variable template, find where it was
2481 // instantiated from. FIXME: Is this necessary?
2482 if (VarTemplateDecl *VarTemplate = VD->getDescribedVarTemplate()) {
2483 while (!VarTemplate->isMemberSpecialization()) {
2484 auto *NewVT = VarTemplate->getInstantiatedFromMemberTemplate();
2487 VarTemplate = NewVT;
2490 return getDefinitionOrSelf(VarTemplate->getTemplatedDecl());
2495 return getDefinitionOrSelf(const_cast<VarDecl*>(VD));
2498 VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2499 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2500 return cast<VarDecl>(MSI->getInstantiatedFrom());
2505 TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2506 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2507 return Spec->getSpecializationKind();
2509 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2510 return MSI->getTemplateSpecializationKind();
2512 return TSK_Undeclared;
2515 TemplateSpecializationKind
2516 VarDecl::getTemplateSpecializationKindForInstantiation() const {
2517 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2518 return MSI->getTemplateSpecializationKind();
2520 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2521 return Spec->getSpecializationKind();
2523 return TSK_Undeclared;
2526 SourceLocation VarDecl::getPointOfInstantiation() const {
2527 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2528 return Spec->getPointOfInstantiation();
2530 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2531 return MSI->getPointOfInstantiation();
2533 return SourceLocation();
2536 VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2537 return getASTContext().getTemplateOrSpecializationInfo(this)
2538 .dyn_cast<VarTemplateDecl *>();
2541 void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2542 getASTContext().setTemplateOrSpecializationInfo(this, Template);
2545 bool VarDecl::isKnownToBeDefined() const {
2546 const auto &LangOpts = getASTContext().getLangOpts();
2547 // In CUDA mode without relocatable device code, variables of form 'extern
2548 // __shared__ Foo foo[]' are pointers to the base of the GPU core's shared
2549 // memory pool. These are never undefined variables, even if they appear
2550 // inside of an anon namespace or static function.
2552 // With CUDA relocatable device code enabled, these variables don't get
2553 // special handling; they're treated like regular extern variables.
2554 if (LangOpts.CUDA && !LangOpts.GPURelocatableDeviceCode &&
2555 hasExternalStorage() && hasAttr<CUDASharedAttr>() &&
2556 isa<IncompleteArrayType>(getType()))
2559 return hasDefinition();
2562 bool VarDecl::isNoDestroy(const ASTContext &Ctx) const {
2563 return hasGlobalStorage() && (hasAttr<NoDestroyAttr>() ||
2564 (!Ctx.getLangOpts().RegisterStaticDestructors &&
2565 !hasAttr<AlwaysDestroyAttr>()));
2568 MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2569 if (isStaticDataMember())
2571 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2572 return getASTContext().getTemplateOrSpecializationInfo(this)
2573 .dyn_cast<MemberSpecializationInfo *>();
2577 void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2578 SourceLocation PointOfInstantiation) {
2579 assert((isa<VarTemplateSpecializationDecl>(this) ||
2580 getMemberSpecializationInfo()) &&
2581 "not a variable or static data member template specialization");
2583 if (VarTemplateSpecializationDecl *Spec =
2584 dyn_cast<VarTemplateSpecializationDecl>(this)) {
2585 Spec->setSpecializationKind(TSK);
2586 if (TSK != TSK_ExplicitSpecialization &&
2587 PointOfInstantiation.isValid() &&
2588 Spec->getPointOfInstantiation().isInvalid()) {
2589 Spec->setPointOfInstantiation(PointOfInstantiation);
2590 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2591 L->InstantiationRequested(this);
2593 } else if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2594 MSI->setTemplateSpecializationKind(TSK);
2595 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2596 MSI->getPointOfInstantiation().isInvalid()) {
2597 MSI->setPointOfInstantiation(PointOfInstantiation);
2598 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2599 L->InstantiationRequested(this);
2605 VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2606 TemplateSpecializationKind TSK) {
2607 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&
2608 "Previous template or instantiation?");
2609 getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2612 //===----------------------------------------------------------------------===//
2613 // ParmVarDecl Implementation
2614 //===----------------------------------------------------------------------===//
2616 ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2617 SourceLocation StartLoc,
2618 SourceLocation IdLoc, IdentifierInfo *Id,
2619 QualType T, TypeSourceInfo *TInfo,
2620 StorageClass S, Expr *DefArg) {
2621 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2625 QualType ParmVarDecl::getOriginalType() const {
2626 TypeSourceInfo *TSI = getTypeSourceInfo();
2627 QualType T = TSI ? TSI->getType() : getType();
2628 if (const auto *DT = dyn_cast<DecayedType>(T))
2629 return DT->getOriginalType();
2633 ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2635 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2636 nullptr, QualType(), nullptr, SC_None, nullptr);
2639 SourceRange ParmVarDecl::getSourceRange() const {
2640 if (!hasInheritedDefaultArg()) {
2641 SourceRange ArgRange = getDefaultArgRange();
2642 if (ArgRange.isValid())
2643 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2646 // DeclaratorDecl considers the range of postfix types as overlapping with the
2647 // declaration name, but this is not the case with parameters in ObjC methods.
2648 if (isa<ObjCMethodDecl>(getDeclContext()))
2649 return SourceRange(DeclaratorDecl::getBeginLoc(), getLocation());
2651 return DeclaratorDecl::getSourceRange();
2654 Expr *ParmVarDecl::getDefaultArg() {
2655 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!");
2656 assert(!hasUninstantiatedDefaultArg() &&
2657 "Default argument is not yet instantiated!");
2659 Expr *Arg = getInit();
2660 if (auto *E = dyn_cast_or_null<FullExpr>(Arg))
2661 return E->getSubExpr();
2666 void ParmVarDecl::setDefaultArg(Expr *defarg) {
2667 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2671 SourceRange ParmVarDecl::getDefaultArgRange() const {
2672 switch (ParmVarDeclBits.DefaultArgKind) {
2675 // Nothing we can do here.
2676 return SourceRange();
2678 case DAK_Uninstantiated:
2679 return getUninstantiatedDefaultArg()->getSourceRange();
2682 if (const Expr *E = getInit())
2683 return E->getSourceRange();
2685 // Missing an actual expression, may be invalid.
2686 return SourceRange();
2688 llvm_unreachable("Invalid default argument kind.");
2691 void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2692 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2696 Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2697 assert(hasUninstantiatedDefaultArg() &&
2698 "Wrong kind of initialization expression!");
2699 return cast_or_null<Expr>(Init.get<Stmt *>());
2702 bool ParmVarDecl::hasDefaultArg() const {
2703 // FIXME: We should just return false for DAK_None here once callers are
2704 // prepared for the case that we encountered an invalid default argument and
2705 // were unable to even build an invalid expression.
2706 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
2710 void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
2711 getASTContext().setParameterIndex(this, parameterIndex);
2712 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2715 unsigned ParmVarDecl::getParameterIndexLarge() const {
2716 return getASTContext().getParameterIndex(this);
2719 //===----------------------------------------------------------------------===//
2720 // FunctionDecl Implementation
2721 //===----------------------------------------------------------------------===//
2723 FunctionDecl::FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC,
2724 SourceLocation StartLoc,
2725 const DeclarationNameInfo &NameInfo, QualType T,
2726 TypeSourceInfo *TInfo, StorageClass S,
2727 bool isInlineSpecified,
2728 ConstexprSpecKind ConstexprKind)
2729 : DeclaratorDecl(DK, DC, NameInfo.getLoc(), NameInfo.getName(), T, TInfo,
2731 DeclContext(DK), redeclarable_base(C), ODRHash(0),
2732 EndRangeLoc(NameInfo.getEndLoc()), DNLoc(NameInfo.getInfo()) {
2733 assert(T.isNull() || T->isFunctionType());
2734 FunctionDeclBits.SClass = S;
2735 FunctionDeclBits.IsInline = isInlineSpecified;
2736 FunctionDeclBits.IsInlineSpecified = isInlineSpecified;
2737 FunctionDeclBits.IsVirtualAsWritten = false;
2738 FunctionDeclBits.IsPure = false;
2739 FunctionDeclBits.HasInheritedPrototype = false;
2740 FunctionDeclBits.HasWrittenPrototype = true;
2741 FunctionDeclBits.IsDeleted = false;
2742 FunctionDeclBits.IsTrivial = false;
2743 FunctionDeclBits.IsTrivialForCall = false;
2744 FunctionDeclBits.IsDefaulted = false;
2745 FunctionDeclBits.IsExplicitlyDefaulted = false;
2746 FunctionDeclBits.HasImplicitReturnZero = false;
2747 FunctionDeclBits.IsLateTemplateParsed = false;
2748 FunctionDeclBits.ConstexprKind = ConstexprKind;
2749 FunctionDeclBits.InstantiationIsPending = false;
2750 FunctionDeclBits.UsesSEHTry = false;
2751 FunctionDeclBits.HasSkippedBody = false;
2752 FunctionDeclBits.WillHaveBody = false;
2753 FunctionDeclBits.IsMultiVersion = false;
2754 FunctionDeclBits.IsCopyDeductionCandidate = false;
2755 FunctionDeclBits.HasODRHash = false;
2758 void FunctionDecl::getNameForDiagnostic(
2759 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
2760 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
2761 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
2763 printTemplateArgumentList(OS, TemplateArgs->asArray(), Policy);
2766 bool FunctionDecl::isVariadic() const {
2767 if (const auto *FT = getType()->getAs<FunctionProtoType>())
2768 return FT->isVariadic();
2772 bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
2773 for (auto I : redecls()) {
2774 if (I->doesThisDeclarationHaveABody()) {
2783 bool FunctionDecl::hasTrivialBody() const
2785 Stmt *S = getBody();
2787 // Since we don't have a body for this function, we don't know if it's
2792 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
2797 bool FunctionDecl::isDefined(const FunctionDecl *&Definition) const {
2798 for (auto I : redecls()) {
2799 if (I->isThisDeclarationADefinition()) {
2808 Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
2809 if (!hasBody(Definition))
2812 if (Definition->Body)
2813 return Definition->Body.get(getASTContext().getExternalSource());
2818 void FunctionDecl::setBody(Stmt *B) {
2821 EndRangeLoc = B->getEndLoc();
2824 void FunctionDecl::setPure(bool P) {
2825 FunctionDeclBits.IsPure = P;
2827 if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
2828 Parent->markedVirtualFunctionPure();
2831 template<std::size_t Len>
2832 static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
2833 IdentifierInfo *II = ND->getIdentifier();
2834 return II && II->isStr(Str);
2837 bool FunctionDecl::isMain() const {
2838 const TranslationUnitDecl *tunit =
2839 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2841 !tunit->getASTContext().getLangOpts().Freestanding &&
2842 isNamed(this, "main");
2845 bool FunctionDecl::isMSVCRTEntryPoint() const {
2846 const TranslationUnitDecl *TUnit =
2847 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2851 // Even though we aren't really targeting MSVCRT if we are freestanding,
2852 // semantic analysis for these functions remains the same.
2854 // MSVCRT entry points only exist on MSVCRT targets.
2855 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
2858 // Nameless functions like constructors cannot be entry points.
2859 if (!getIdentifier())
2862 return llvm::StringSwitch<bool>(getName())
2863 .Cases("main", // an ANSI console app
2864 "wmain", // a Unicode console App
2865 "WinMain", // an ANSI GUI app
2866 "wWinMain", // a Unicode GUI app
2872 bool FunctionDecl::isReservedGlobalPlacementOperator() const {
2873 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName);
2874 assert(getDeclName().getCXXOverloadedOperator() == OO_New ||
2875 getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2876 getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
2877 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete);
2879 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2882 const auto *proto = getType()->castAs<FunctionProtoType>();
2883 if (proto->getNumParams() != 2 || proto->isVariadic())
2886 ASTContext &Context =
2887 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
2890 // The result type and first argument type are constant across all
2891 // these operators. The second argument must be exactly void*.
2892 return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
2895 bool FunctionDecl::isReplaceableGlobalAllocationFunction(bool *IsAligned) const {
2896 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
2898 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
2899 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
2900 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
2901 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
2904 if (isa<CXXRecordDecl>(getDeclContext()))
2907 // This can only fail for an invalid 'operator new' declaration.
2908 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2911 const auto *FPT = getType()->castAs<FunctionProtoType>();
2912 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
2915 // If this is a single-parameter function, it must be a replaceable global
2916 // allocation or deallocation function.
2917 if (FPT->getNumParams() == 1)
2920 unsigned Params = 1;
2921 QualType Ty = FPT->getParamType(Params);
2922 ASTContext &Ctx = getASTContext();
2924 auto Consume = [&] {
2926 Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
2929 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
2930 bool IsSizedDelete = false;
2931 if (Ctx.getLangOpts().SizedDeallocation &&
2932 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2933 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
2934 Ctx.hasSameType(Ty, Ctx.getSizeType())) {
2935 IsSizedDelete = true;
2939 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
2941 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT()) {
2947 // Finally, if this is not a sized delete, the final parameter can
2948 // be a 'const std::nothrow_t&'.
2949 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
2950 Ty = Ty->getPointeeType();
2951 if (Ty.getCVRQualifiers() != Qualifiers::Const)
2953 const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
2954 if (RD && isNamed(RD, "nothrow_t") && RD->isInStdNamespace())
2958 return Params == FPT->getNumParams();
2961 bool FunctionDecl::isDestroyingOperatorDelete() const {
2963 // Within a class C, a single object deallocation function with signature
2964 // (T, std::destroying_delete_t, <more params>)
2965 // is a destroying operator delete.
2966 if (!isa<CXXMethodDecl>(this) || getOverloadedOperator() != OO_Delete ||
2970 auto *RD = getParamDecl(1)->getType()->getAsCXXRecordDecl();
2971 return RD && RD->isInStdNamespace() && RD->getIdentifier() &&
2972 RD->getIdentifier()->isStr("destroying_delete_t");
2975 LanguageLinkage FunctionDecl::getLanguageLinkage() const {
2976 return getDeclLanguageLinkage(*this);
2979 bool FunctionDecl::isExternC() const {
2980 return isDeclExternC(*this);
2983 bool FunctionDecl::isInExternCContext() const {
2984 if (hasAttr<OpenCLKernelAttr>())
2986 return getLexicalDeclContext()->isExternCContext();
2989 bool FunctionDecl::isInExternCXXContext() const {
2990 return getLexicalDeclContext()->isExternCXXContext();
2993 bool FunctionDecl::isGlobal() const {
2994 if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
2995 return Method->isStatic();
2997 if (getCanonicalDecl()->getStorageClass() == SC_Static)
3000 for (const DeclContext *DC = getDeclContext();
3002 DC = DC->getParent()) {
3003 if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
3004 if (!Namespace->getDeclName())
3013 bool FunctionDecl::isNoReturn() const {
3014 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
3015 hasAttr<C11NoReturnAttr>())
3018 if (auto *FnTy = getType()->getAs<FunctionType>())
3019 return FnTy->getNoReturnAttr();
3025 MultiVersionKind FunctionDecl::getMultiVersionKind() const {
3026 if (hasAttr<TargetAttr>())
3027 return MultiVersionKind::Target;
3028 if (hasAttr<CPUDispatchAttr>())
3029 return MultiVersionKind::CPUDispatch;
3030 if (hasAttr<CPUSpecificAttr>())
3031 return MultiVersionKind::CPUSpecific;
3032 return MultiVersionKind::None;
3035 bool FunctionDecl::isCPUDispatchMultiVersion() const {
3036 return isMultiVersion() && hasAttr<CPUDispatchAttr>();
3039 bool FunctionDecl::isCPUSpecificMultiVersion() const {
3040 return isMultiVersion() && hasAttr<CPUSpecificAttr>();
3043 bool FunctionDecl::isTargetMultiVersion() const {
3044 return isMultiVersion() && hasAttr<TargetAttr>();
3048 FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
3049 redeclarable_base::setPreviousDecl(PrevDecl);
3051 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
3052 FunctionTemplateDecl *PrevFunTmpl
3053 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
3054 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch");
3055 FunTmpl->setPreviousDecl(PrevFunTmpl);
3058 if (PrevDecl && PrevDecl->isInlined())
3059 setImplicitlyInline(true);
3062 FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
3064 /// Returns a value indicating whether this function corresponds to a builtin
3067 /// The function corresponds to a built-in function if it is declared at
3068 /// translation scope or within an extern "C" block and its name matches with
3069 /// the name of a builtin. The returned value will be 0 for functions that do
3070 /// not correspond to a builtin, a value of type \c Builtin::ID if in the
3071 /// target-independent range \c [1,Builtin::First), or a target-specific builtin
3074 /// \param ConsiderWrapperFunctions If true, we should consider wrapper
3075 /// functions as their wrapped builtins. This shouldn't be done in general, but
3076 /// it's useful in Sema to diagnose calls to wrappers based on their semantics.
3077 unsigned FunctionDecl::getBuiltinID(bool ConsiderWrapperFunctions) const {
3078 if (!getIdentifier())
3081 unsigned BuiltinID = getIdentifier()->getBuiltinID();
3085 ASTContext &Context = getASTContext();
3086 if (Context.getLangOpts().CPlusPlus) {
3087 const auto *LinkageDecl =
3088 dyn_cast<LinkageSpecDecl>(getFirstDecl()->getDeclContext());
3089 // In C++, the first declaration of a builtin is always inside an implicit
3091 // FIXME: A recognised library function may not be directly in an extern "C"
3092 // declaration, for instance "extern "C" { namespace std { decl } }".
3094 if (BuiltinID == Builtin::BI__GetExceptionInfo &&
3095 Context.getTargetInfo().getCXXABI().isMicrosoft())
3096 return Builtin::BI__GetExceptionInfo;
3099 if (LinkageDecl->getLanguage() != LinkageSpecDecl::lang_c)
3103 // If the function is marked "overloadable", it has a different mangled name
3104 // and is not the C library function.
3105 if (!ConsiderWrapperFunctions && hasAttr<OverloadableAttr>())
3108 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3111 // This function has the name of a known C library
3112 // function. Determine whether it actually refers to the C library
3113 // function or whether it just has the same name.
3115 // If this is a static function, it's not a builtin.
3116 if (!ConsiderWrapperFunctions && getStorageClass() == SC_Static)
3119 // OpenCL v1.2 s6.9.f - The library functions defined in
3120 // the C99 standard headers are not available.
3121 if (Context.getLangOpts().OpenCL &&
3122 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3125 // CUDA does not have device-side standard library. printf and malloc are the
3126 // only special cases that are supported by device-side runtime.
3127 if (Context.getLangOpts().CUDA && hasAttr<CUDADeviceAttr>() &&
3128 !hasAttr<CUDAHostAttr>() &&
3129 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3135 /// getNumParams - Return the number of parameters this function must have
3136 /// based on its FunctionType. This is the length of the ParamInfo array
3137 /// after it has been created.
3138 unsigned FunctionDecl::getNumParams() const {
3139 const auto *FPT = getType()->getAs<FunctionProtoType>();
3140 return FPT ? FPT->getNumParams() : 0;
3143 void FunctionDecl::setParams(ASTContext &C,
3144 ArrayRef<ParmVarDecl *> NewParamInfo) {
3145 assert(!ParamInfo && "Already has param info!");
3146 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!");
3148 // Zero params -> null pointer.
3149 if (!NewParamInfo.empty()) {
3150 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
3151 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
3155 /// getMinRequiredArguments - Returns the minimum number of arguments
3156 /// needed to call this function. This may be fewer than the number of
3157 /// function parameters, if some of the parameters have default
3158 /// arguments (in C++) or are parameter packs (C++11).
3159 unsigned FunctionDecl::getMinRequiredArguments() const {
3160 if (!getASTContext().getLangOpts().CPlusPlus)
3161 return getNumParams();
3163 unsigned NumRequiredArgs = 0;
3164 for (auto *Param : parameters())
3165 if (!Param->isParameterPack() && !Param->hasDefaultArg())
3167 return NumRequiredArgs;
3170 /// The combination of the extern and inline keywords under MSVC forces
3171 /// the function to be required.
3173 /// Note: This function assumes that we will only get called when isInlined()
3174 /// would return true for this FunctionDecl.
3175 bool FunctionDecl::isMSExternInline() const {
3176 assert(isInlined() && "expected to get called on an inlined function!");
3178 const ASTContext &Context = getASTContext();
3179 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3180 !hasAttr<DLLExportAttr>())
3183 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
3184 FD = FD->getPreviousDecl())
3185 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3191 static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
3192 if (Redecl->getStorageClass() != SC_Extern)
3195 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
3196 FD = FD->getPreviousDecl())
3197 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3203 static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
3204 // Only consider file-scope declarations in this test.
3205 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
3208 // Only consider explicit declarations; the presence of a builtin for a
3209 // libcall shouldn't affect whether a definition is externally visible.
3210 if (Redecl->isImplicit())
3213 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
3214 return true; // Not an inline definition
3219 /// For a function declaration in C or C++, determine whether this
3220 /// declaration causes the definition to be externally visible.
3222 /// For instance, this determines if adding the current declaration to the set
3223 /// of redeclarations of the given functions causes
3224 /// isInlineDefinitionExternallyVisible to change from false to true.
3225 bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
3226 assert(!doesThisDeclarationHaveABody() &&
3227 "Must have a declaration without a body.");
3229 ASTContext &Context = getASTContext();
3231 if (Context.getLangOpts().MSVCCompat) {
3232 const FunctionDecl *Definition;
3233 if (hasBody(Definition) && Definition->isInlined() &&
3234 redeclForcesDefMSVC(this))
3238 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3239 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
3240 // an externally visible definition.
3242 // FIXME: What happens if gnu_inline gets added on after the first
3244 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
3247 const FunctionDecl *Prev = this;
3248 bool FoundBody = false;
3249 while ((Prev = Prev->getPreviousDecl())) {
3250 FoundBody |= Prev->Body.isValid();
3253 // If it's not the case that both 'inline' and 'extern' are
3254 // specified on the definition, then it is always externally visible.
3255 if (!Prev->isInlineSpecified() ||
3256 Prev->getStorageClass() != SC_Extern)
3258 } else if (Prev->isInlineSpecified() &&
3259 Prev->getStorageClass() != SC_Extern) {
3266 if (Context.getLangOpts().CPlusPlus)
3270 // [...] If all of the file scope declarations for a function in a
3271 // translation unit include the inline function specifier without extern,
3272 // then the definition in that translation unit is an inline definition.
3273 if (isInlineSpecified() && getStorageClass() != SC_Extern)
3275 const FunctionDecl *Prev = this;
3276 bool FoundBody = false;
3277 while ((Prev = Prev->getPreviousDecl())) {
3278 FoundBody |= Prev->Body.isValid();
3279 if (RedeclForcesDefC99(Prev))
3285 SourceRange FunctionDecl::getReturnTypeSourceRange() const {
3286 const TypeSourceInfo *TSI = getTypeSourceInfo();
3288 return SourceRange();
3289 FunctionTypeLoc FTL =
3290 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
3292 return SourceRange();
3294 // Skip self-referential return types.
3295 const SourceManager &SM = getASTContext().getSourceManager();
3296 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
3297 SourceLocation Boundary = getNameInfo().getBeginLoc();
3298 if (RTRange.isInvalid() || Boundary.isInvalid() ||
3299 !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
3300 return SourceRange();
3305 SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
3306 const TypeSourceInfo *TSI = getTypeSourceInfo();
3308 return SourceRange();
3309 FunctionTypeLoc FTL =
3310 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
3312 return SourceRange();
3314 return FTL.getExceptionSpecRange();
3317 /// For an inline function definition in C, or for a gnu_inline function
3318 /// in C++, determine whether the definition will be externally visible.
3320 /// Inline function definitions are always available for inlining optimizations.
3321 /// However, depending on the language dialect, declaration specifiers, and
3322 /// attributes, the definition of an inline function may or may not be
3323 /// "externally" visible to other translation units in the program.
3325 /// In C99, inline definitions are not externally visible by default. However,
3326 /// if even one of the global-scope declarations is marked "extern inline", the
3327 /// inline definition becomes externally visible (C99 6.7.4p6).
3329 /// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3330 /// definition, we use the GNU semantics for inline, which are nearly the
3331 /// opposite of C99 semantics. In particular, "inline" by itself will create
3332 /// an externally visible symbol, but "extern inline" will not create an
3333 /// externally visible symbol.
3334 bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3335 assert((doesThisDeclarationHaveABody() || willHaveBody() ||
3336 hasAttr<AliasAttr>()) &&
3337 "Must be a function definition");
3338 assert(isInlined() && "Function must be inline");
3339 ASTContext &Context = getASTContext();
3341 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3342 // Note: If you change the logic here, please change
3343 // doesDeclarationForceExternallyVisibleDefinition as well.
3345 // If it's not the case that both 'inline' and 'extern' are
3346 // specified on the definition, then this inline definition is
3347 // externally visible.
3348 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3351 // If any declaration is 'inline' but not 'extern', then this definition
3352 // is externally visible.
3353 for (auto Redecl : redecls()) {
3354 if (Redecl->isInlineSpecified() &&
3355 Redecl->getStorageClass() != SC_Extern)
3362 // The rest of this function is C-only.
3363 assert(!Context.getLangOpts().CPlusPlus &&
3364 "should not use C inline rules in C++");
3367 // [...] If all of the file scope declarations for a function in a
3368 // translation unit include the inline function specifier without extern,
3369 // then the definition in that translation unit is an inline definition.
3370 for (auto Redecl : redecls()) {
3371 if (RedeclForcesDefC99(Redecl))
3376 // An inline definition does not provide an external definition for the
3377 // function, and does not forbid an external definition in another
3378 // translation unit.
3382 /// getOverloadedOperator - Which C++ overloaded operator this
3383 /// function represents, if any.
3384 OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3385 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3386 return getDeclName().getCXXOverloadedOperator();
3391 /// getLiteralIdentifier - The literal suffix identifier this function
3392 /// represents, if any.
3393 const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3394 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3395 return getDeclName().getCXXLiteralIdentifier();
3400 FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3401 if (TemplateOrSpecialization.isNull())
3402 return TK_NonTemplate;
3403 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
3404 return TK_FunctionTemplate;
3405 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3406 return TK_MemberSpecialization;
3407 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3408 return TK_FunctionTemplateSpecialization;
3409 if (TemplateOrSpecialization.is
3410 <DependentFunctionTemplateSpecializationInfo*>())
3411 return TK_DependentFunctionTemplateSpecialization;
3413 llvm_unreachable("Did we miss a TemplateOrSpecialization type?");
3416 FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
3417 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
3418 return cast<FunctionDecl>(Info->getInstantiatedFrom());
3423 MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
3425 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3427 if (auto *FTSI = TemplateOrSpecialization
3428 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3429 return FTSI->getMemberSpecializationInfo();
3434 FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
3436 TemplateSpecializationKind TSK) {
3437 assert(TemplateOrSpecialization.isNull() &&
3438 "Member function is already a specialization");
3439 MemberSpecializationInfo *Info
3440 = new (C) MemberSpecializationInfo(FD, TSK);
3441 TemplateOrSpecialization = Info;
3444 FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
3445 return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3448 void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
3449 assert(TemplateOrSpecialization.isNull() &&
3450 "Member function is already a specialization");
3451 TemplateOrSpecialization = Template;
3454 bool FunctionDecl::isImplicitlyInstantiable() const {
3455 // If the function is invalid, it can't be implicitly instantiated.
3456 if (isInvalidDecl())
3459 switch (getTemplateSpecializationKindForInstantiation()) {
3460 case TSK_Undeclared:
3461 case TSK_ExplicitInstantiationDefinition:
3462 case TSK_ExplicitSpecialization:
3465 case TSK_ImplicitInstantiation:
3468 case TSK_ExplicitInstantiationDeclaration:
3473 // Find the actual template from which we will instantiate.
3474 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
3475 bool HasPattern = false;
3477 HasPattern = PatternDecl->hasBody(PatternDecl);
3479 // C++0x [temp.explicit]p9:
3480 // Except for inline functions, other explicit instantiation declarations
3481 // have the effect of suppressing the implicit instantiation of the entity
3482 // to which they refer.
3483 if (!HasPattern || !PatternDecl)
3486 return PatternDecl->isInlined();
3489 bool FunctionDecl::isTemplateInstantiation() const {
3490 // FIXME: Remove this, it's not clear what it means. (Which template
3491 // specialization kind?)
3492 return clang::isTemplateInstantiation(getTemplateSpecializationKind());
3495 FunctionDecl *FunctionDecl::getTemplateInstantiationPattern() const {
3496 // If this is a generic lambda call operator specialization, its
3497 // instantiation pattern is always its primary template's pattern
3498 // even if its primary template was instantiated from another
3499 // member template (which happens with nested generic lambdas).
3500 // Since a lambda's call operator's body is transformed eagerly,
3501 // we don't have to go hunting for a prototype definition template
3502 // (i.e. instantiated-from-member-template) to use as an instantiation
3505 if (isGenericLambdaCallOperatorSpecialization(
3506 dyn_cast<CXXMethodDecl>(this))) {
3507 assert(getPrimaryTemplate() && "not a generic lambda call operator?");
3508 return getDefinitionOrSelf(getPrimaryTemplate()->getTemplatedDecl());
3511 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo()) {
3512 if (!clang::isTemplateInstantiation(Info->getTemplateSpecializationKind()))
3514 return getDefinitionOrSelf(cast<FunctionDecl>(Info->getInstantiatedFrom()));
3517 if (!clang::isTemplateInstantiation(getTemplateSpecializationKind()))
3520 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
3521 // If we hit a point where the user provided a specialization of this
3522 // template, we're done looking.
3523 while (!Primary->isMemberSpecialization()) {
3524 auto *NewPrimary = Primary->getInstantiatedFromMemberTemplate();
3527 Primary = NewPrimary;
3530 return getDefinitionOrSelf(Primary->getTemplatedDecl());
3536 FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
3537 if (FunctionTemplateSpecializationInfo *Info
3538 = TemplateOrSpecialization
3539 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3540 return Info->getTemplate();
3545 FunctionTemplateSpecializationInfo *
3546 FunctionDecl::getTemplateSpecializationInfo() const {
3547 return TemplateOrSpecialization
3548 .dyn_cast<FunctionTemplateSpecializationInfo *>();
3551 const TemplateArgumentList *
3552 FunctionDecl::getTemplateSpecializationArgs() const {
3553 if (FunctionTemplateSpecializationInfo *Info
3554 = TemplateOrSpecialization
3555 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3556 return Info->TemplateArguments;
3561 const ASTTemplateArgumentListInfo *
3562 FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
3563 if (FunctionTemplateSpecializationInfo *Info
3564 = TemplateOrSpecialization
3565 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3566 return Info->TemplateArgumentsAsWritten;
3572 FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
3573 FunctionTemplateDecl *Template,
3574 const TemplateArgumentList *TemplateArgs,
3576 TemplateSpecializationKind TSK,
3577 const TemplateArgumentListInfo *TemplateArgsAsWritten,
3578 SourceLocation PointOfInstantiation) {
3579 assert((TemplateOrSpecialization.isNull() ||
3580 TemplateOrSpecialization.is<MemberSpecializationInfo *>()) &&
3581 "Member function is already a specialization");
3582 assert(TSK != TSK_Undeclared &&
3583 "Must specify the type of function template specialization");
3584 assert((TemplateOrSpecialization.isNull() ||
3585 TSK == TSK_ExplicitSpecialization) &&
3586 "Member specialization must be an explicit specialization");
3587 FunctionTemplateSpecializationInfo *Info =
3588 FunctionTemplateSpecializationInfo::Create(
3589 C, this, Template, TSK, TemplateArgs, TemplateArgsAsWritten,
3590 PointOfInstantiation,
3591 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>());
3592 TemplateOrSpecialization = Info;
3593 Template->addSpecialization(Info, InsertPos);
3597 FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
3598 const UnresolvedSetImpl &Templates,
3599 const TemplateArgumentListInfo &TemplateArgs) {
3600 assert(TemplateOrSpecialization.isNull());
3601 DependentFunctionTemplateSpecializationInfo *Info =
3602 DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
3604 TemplateOrSpecialization = Info;
3607 DependentFunctionTemplateSpecializationInfo *
3608 FunctionDecl::getDependentSpecializationInfo() const {
3609 return TemplateOrSpecialization
3610 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3613 DependentFunctionTemplateSpecializationInfo *
3614 DependentFunctionTemplateSpecializationInfo::Create(
3615 ASTContext &Context, const UnresolvedSetImpl &Ts,
3616 const TemplateArgumentListInfo &TArgs) {
3617 void *Buffer = Context.Allocate(
3618 totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
3619 TArgs.size(), Ts.size()));
3620 return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
3623 DependentFunctionTemplateSpecializationInfo::
3624 DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
3625 const TemplateArgumentListInfo &TArgs)
3626 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
3627 NumTemplates = Ts.size();
3628 NumArgs = TArgs.size();
3630 FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
3631 for (unsigned I = 0, E = Ts.size(); I != E; ++I)
3632 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());
3634 TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
3635 for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
3636 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
3639 TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
3640 // For a function template specialization, query the specialization
3641 // information object.
3642 if (FunctionTemplateSpecializationInfo *FTSInfo =
3643 TemplateOrSpecialization
3644 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3645 return FTSInfo->getTemplateSpecializationKind();
3647 if (MemberSpecializationInfo *MSInfo =
3648 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3649 return MSInfo->getTemplateSpecializationKind();
3651 return TSK_Undeclared;
3654 TemplateSpecializationKind
3655 FunctionDecl::getTemplateSpecializationKindForInstantiation() const {
3656 // This is the same as getTemplateSpecializationKind(), except that for a
3657 // function that is both a function template specialization and a member
3658 // specialization, we prefer the member specialization information. Eg:
3660 // template<typename T> struct A {
3661 // template<typename U> void f() {}
3662 // template<> void f<int>() {}
3665 // For A<int>::f<int>():
3666 // * getTemplateSpecializationKind() will return TSK_ExplicitSpecialization
3667 // * getTemplateSpecializationKindForInstantiation() will return
3668 // TSK_ImplicitInstantiation
3670 // This reflects the facts that A<int>::f<int> is an explicit specialization
3671 // of A<int>::f, and that A<int>::f<int> should be implicitly instantiated
3672 // from A::f<int> if a definition is needed.
3673 if (FunctionTemplateSpecializationInfo *FTSInfo =
3674 TemplateOrSpecialization
3675 .dyn_cast<FunctionTemplateSpecializationInfo *>()) {
3676 if (auto *MSInfo = FTSInfo->getMemberSpecializationInfo())
3677 return MSInfo->getTemplateSpecializationKind();
3678 return FTSInfo->getTemplateSpecializationKind();
3681 if (MemberSpecializationInfo *MSInfo =
3682 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3683 return MSInfo->getTemplateSpecializationKind();
3685 return TSK_Undeclared;
3689 FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3690 SourceLocation PointOfInstantiation) {
3691 if (FunctionTemplateSpecializationInfo *FTSInfo
3692 = TemplateOrSpecialization.dyn_cast<
3693 FunctionTemplateSpecializationInfo*>()) {
3694 FTSInfo->setTemplateSpecializationKind(TSK);
3695 if (TSK != TSK_ExplicitSpecialization &&
3696 PointOfInstantiation.isValid() &&
3697 FTSInfo->getPointOfInstantiation().isInvalid()) {
3698 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
3699 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3700 L->InstantiationRequested(this);
3702 } else if (MemberSpecializationInfo *MSInfo
3703 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
3704 MSInfo->setTemplateSpecializationKind(TSK);
3705 if (TSK != TSK_ExplicitSpecialization &&
3706 PointOfInstantiation.isValid() &&
3707 MSInfo->getPointOfInstantiation().isInvalid()) {
3708 MSInfo->setPointOfInstantiation(PointOfInstantiation);
3709 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3710 L->InstantiationRequested(this);
3713 llvm_unreachable("Function cannot have a template specialization kind");
3716 SourceLocation FunctionDecl::getPointOfInstantiation() const {
3717 if (FunctionTemplateSpecializationInfo *FTSInfo
3718 = TemplateOrSpecialization.dyn_cast<
3719 FunctionTemplateSpecializationInfo*>())
3720 return FTSInfo->getPointOfInstantiation();
3721 else if (MemberSpecializationInfo *MSInfo
3722 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>())
3723 return MSInfo->getPointOfInstantiation();
3725 return SourceLocation();
3728 bool FunctionDecl::isOutOfLine() const {
3729 if (Decl::isOutOfLine())
3732 // If this function was instantiated from a member function of a
3733 // class template, check whether that member function was defined out-of-line.
3734 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
3735 const FunctionDecl *Definition;
3736 if (FD->hasBody(Definition))
3737 return Definition->isOutOfLine();
3740 // If this function was instantiated from a function template,
3741 // check whether that function template was defined out-of-line.
3742 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
3743 const FunctionDecl *Definition;
3744 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
3745 return Definition->isOutOfLine();
3751 SourceRange FunctionDecl::getSourceRange() const {
3752 return SourceRange(getOuterLocStart(), EndRangeLoc);
3755 unsigned FunctionDecl::getMemoryFunctionKind() const {
3756 IdentifierInfo *FnInfo = getIdentifier();
3761 // Builtin handling.
3762 switch (getBuiltinID()) {
3763 case Builtin::BI__builtin_memset:
3764 case Builtin::BI__builtin___memset_chk:
3765 case Builtin::BImemset:
3766 return Builtin::BImemset;
3768 case Builtin::BI__builtin_memcpy:
3769 case Builtin::BI__builtin___memcpy_chk:
3770 case Builtin::BImemcpy:
3771 return Builtin::BImemcpy;
3773 case Builtin::BI__builtin_memmove:
3774 case Builtin::BI__builtin___memmove_chk:
3775 case Builtin::BImemmove:
3776 return Builtin::BImemmove;
3778 case Builtin::BIstrlcpy:
3779 case Builtin::BI__builtin___strlcpy_chk:
3780 return Builtin::BIstrlcpy;
3782 case Builtin::BIstrlcat:
3783 case Builtin::BI__builtin___strlcat_chk:
3784 return Builtin::BIstrlcat;
3786 case Builtin::BI__builtin_memcmp:
3787 case Builtin::BImemcmp:
3788 return Builtin::BImemcmp;
3790 case Builtin::BI__builtin_bcmp:
3791 case Builtin::BIbcmp:
3792 return Builtin::BIbcmp;
3794 case Builtin::BI__builtin_strncpy:
3795 case Builtin::BI__builtin___strncpy_chk:
3796 case Builtin::BIstrncpy:
3797 return Builtin::BIstrncpy;
3799 case Builtin::BI__builtin_strncmp:
3800 case Builtin::BIstrncmp:
3801 return Builtin::BIstrncmp;
3803 case Builtin::BI__builtin_strncasecmp:
3804 case Builtin::BIstrncasecmp:
3805 return Builtin::BIstrncasecmp;
3807 case Builtin::BI__builtin_strncat:
3808 case Builtin::BI__builtin___strncat_chk:
3809 case Builtin::BIstrncat:
3810 return Builtin::BIstrncat;
3812 case Builtin::BI__builtin_strndup:
3813 case Builtin::BIstrndup:
3814 return Builtin::BIstrndup;
3816 case Builtin::BI__builtin_strlen:
3817 case Builtin::BIstrlen:
3818 return Builtin::BIstrlen;
3820 case Builtin::BI__builtin_bzero:
3821 case Builtin::BIbzero:
3822 return Builtin::BIbzero;
3826 if (FnInfo->isStr("memset"))
3827 return Builtin::BImemset;
3828 else if (FnInfo->isStr("memcpy"))
3829 return Builtin::BImemcpy;
3830 else if (FnInfo->isStr("memmove"))
3831 return Builtin::BImemmove;
3832 else if (FnInfo->isStr("memcmp"))
3833 return Builtin::BImemcmp;
3834 else if (FnInfo->isStr("bcmp"))
3835 return Builtin::BIbcmp;
3836 else if (FnInfo->isStr("strncpy"))
3837 return Builtin::BIstrncpy;
3838 else if (FnInfo->isStr("strncmp"))
3839 return Builtin::BIstrncmp;
3840 else if (FnInfo->isStr("strncasecmp"))
3841 return Builtin::BIstrncasecmp;
3842 else if (FnInfo->isStr("strncat"))
3843 return Builtin::BIstrncat;
3844 else if (FnInfo->isStr("strndup"))
3845 return Builtin::BIstrndup;
3846 else if (FnInfo->isStr("strlen"))
3847 return Builtin::BIstrlen;
3848 else if (FnInfo->isStr("bzero"))
3849 return Builtin::BIbzero;
3856 unsigned FunctionDecl::getODRHash() const {
3857 assert(hasODRHash());
3861 unsigned FunctionDecl::getODRHash() {
3865 if (auto *FT = getInstantiatedFromMemberFunction()) {
3866 setHasODRHash(true);
3867 ODRHash = FT->getODRHash();
3872 Hash.AddFunctionDecl(this);
3873 setHasODRHash(true);
3874 ODRHash = Hash.CalculateHash();
3878 //===----------------------------------------------------------------------===//
3879 // FieldDecl Implementation
3880 //===----------------------------------------------------------------------===//
3882 FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
3883 SourceLocation StartLoc, SourceLocation IdLoc,
3884 IdentifierInfo *Id, QualType T,
3885 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
3886 InClassInitStyle InitStyle) {
3887 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
3888 BW, Mutable, InitStyle);
3891 FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
3892 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
3893 SourceLocation(), nullptr, QualType(), nullptr,
3894 nullptr, false, ICIS_NoInit);
3897 bool FieldDecl::isAnonymousStructOrUnion() const {
3898 if (!isImplicit() || getDeclName())
3901 if (const auto *Record = getType()->getAs<RecordType>())
3902 return Record->getDecl()->isAnonymousStructOrUnion();
3907 unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
3908 assert(isBitField() && "not a bitfield");
3909 return getBitWidth()->EvaluateKnownConstInt(Ctx).getZExtValue();
3912 bool FieldDecl::isZeroLengthBitField(const ASTContext &Ctx) const {
3913 return isUnnamedBitfield() && !getBitWidth()->isValueDependent() &&
3914 getBitWidthValue(Ctx) == 0;
3917 bool FieldDecl::isZeroSize(const ASTContext &Ctx) const {
3918 if (isZeroLengthBitField(Ctx))
3921 // C++2a [intro.object]p7:
3922 // An object has nonzero size if it
3923 // -- is not a potentially-overlapping subobject, or
3924 if (!hasAttr<NoUniqueAddressAttr>())
3927 // -- is not of class type, or
3928 const auto *RT = getType()->getAs<RecordType>();
3931 const RecordDecl *RD = RT->getDecl()->getDefinition();
3933 assert(isInvalidDecl() && "valid field has incomplete type");
3937 // -- [has] virtual member functions or virtual base classes, or
3938 // -- has subobjects of nonzero size or bit-fields of nonzero length
3939 const auto *CXXRD = cast<CXXRecordDecl>(RD);
3940 if (!CXXRD->isEmpty())
3943 // Otherwise, [...] the circumstances under which the object has zero size
3944 // are implementation-defined.
3945 // FIXME: This might be Itanium ABI specific; we don't yet know what the MS
3950 unsigned FieldDecl::getFieldIndex() const {
3951 const FieldDecl *Canonical = getCanonicalDecl();
3952 if (Canonical != this)
3953 return Canonical->getFieldIndex();
3955 if (CachedFieldIndex) return CachedFieldIndex - 1;
3958 const RecordDecl *RD = getParent()->getDefinition();
3959 assert(RD && "requested index for field of struct with no definition");
3961 for (auto *Field : RD->fields()) {
3962 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
3966 assert(CachedFieldIndex && "failed to find field in parent");
3967 return CachedFieldIndex - 1;
3970 SourceRange FieldDecl::getSourceRange() const {
3971 const Expr *FinalExpr = getInClassInitializer();
3973 FinalExpr = getBitWidth();
3975 return SourceRange(getInnerLocStart(), FinalExpr->getEndLoc());
3976 return DeclaratorDecl::getSourceRange();
3979 void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
3980 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&
3981 "capturing type in non-lambda or captured record.");
3982 assert(InitStorage.getInt() == ISK_NoInit &&
3983 InitStorage.getPointer() == nullptr &&
3984 "bit width, initializer or captured type already set");
3985 InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
3986 ISK_CapturedVLAType);
3989 //===----------------------------------------------------------------------===//
3990 // TagDecl Implementation
3991 //===----------------------------------------------------------------------===//
3993 TagDecl::TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
3994 SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
3995 SourceLocation StartL)
3996 : TypeDecl(DK, DC, L, Id, StartL), DeclContext(DK), redeclarable_base(C),
3997 TypedefNameDeclOrQualifier((TypedefNameDecl *)nullptr) {
3998 assert((DK != Enum || TK == TTK_Enum) &&
3999 "EnumDecl not matched with TTK_Enum");
4000 setPreviousDecl(PrevDecl);
4002 setCompleteDefinition(false);
4003 setBeingDefined(false);
4004 setEmbeddedInDeclarator(false);
4005 setFreeStanding(false);
4006 setCompleteDefinitionRequired(false);
4009 SourceLocation TagDecl::getOuterLocStart() const {
4010 return getTemplateOrInnerLocStart(this);
4013 SourceRange TagDecl::getSourceRange() const {
4014 SourceLocation RBraceLoc = BraceRange.getEnd();
4015 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
4016 return SourceRange(getOuterLocStart(), E);
4019 TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
4021 void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
4022 TypedefNameDeclOrQualifier = TDD;
4023 if (const Type *T = getTypeForDecl()) {
4025 assert(T->isLinkageValid());
4027 assert(isLinkageValid());
4030 void TagDecl::startDefinition() {
4031 setBeingDefined(true);
4033 if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
4034 struct CXXRecordDecl::DefinitionData *Data =
4035 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
4036 for (auto I : redecls())
4037 cast<CXXRecordDecl>(I)->DefinitionData = Data;
4041 void TagDecl::completeDefinition() {
4042 assert((!isa<CXXRecordDecl>(this) ||
4043 cast<CXXRecordDecl>(this)->hasDefinition()) &&
4044 "definition completed but not started");
4046 setCompleteDefinition(true);
4047 setBeingDefined(false);
4049 if (ASTMutationListener *L = getASTMutationListener())
4050 L->CompletedTagDefinition(this);
4053 TagDecl *TagDecl::getDefinition() const {
4054 if (isCompleteDefinition())
4055 return const_cast<TagDecl *>(this);
4057 // If it's possible for us to have an out-of-date definition, check now.
4058 if (mayHaveOutOfDateDef()) {
4059 if (IdentifierInfo *II = getIdentifier()) {
4060 if (II->isOutOfDate()) {
4061 updateOutOfDate(*II);
4066 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
4067 return CXXRD->getDefinition();
4069 for (auto R : redecls())
4070 if (R->isCompleteDefinition())
4076 void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
4078 // Make sure the extended qualifier info is allocated.
4080 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4081 // Set qualifier info.
4082 getExtInfo()->QualifierLoc = QualifierLoc;
4084 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
4086 if (getExtInfo()->NumTemplParamLists == 0) {
4087 getASTContext().Deallocate(getExtInfo());
4088 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
4091 getExtInfo()->QualifierLoc = QualifierLoc;
4096 void TagDecl::setTemplateParameterListsInfo(
4097 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
4098 assert(!TPLists.empty());
4099 // Make sure the extended decl info is allocated.
4101 // Allocate external info struct.
4102 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4103 // Set the template parameter lists info.
4104 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
4107 //===----------------------------------------------------------------------===//
4108 // EnumDecl Implementation
4109 //===----------------------------------------------------------------------===//
4111 EnumDecl::EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
4112 SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
4113 bool Scoped, bool ScopedUsingClassTag, bool Fixed)
4114 : TagDecl(Enum, TTK_Enum, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4115 assert(Scoped || !ScopedUsingClassTag);
4116 IntegerType = nullptr;
4117 setNumPositiveBits(0);
4118 setNumNegativeBits(0);
4120 setScopedUsingClassTag(ScopedUsingClassTag);
4122 setHasODRHash(false);
4126 void EnumDecl::anchor() {}
4128 EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
4129 SourceLocation StartLoc, SourceLocation IdLoc,
4131 EnumDecl *PrevDecl, bool IsScoped,
4132 bool IsScopedUsingClassTag, bool IsFixed) {
4133 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
4134 IsScoped, IsScopedUsingClassTag, IsFixed);
4135 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4136 C.getTypeDeclType(Enum, PrevDecl);
4140 EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4142 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
4143 nullptr, nullptr, false, false, false);
4144 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4148 SourceRange EnumDecl::getIntegerTypeRange() const {
4149 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
4150 return TI->getTypeLoc().getSourceRange();
4151 return SourceRange();
4154 void EnumDecl::completeDefinition(QualType NewType,
4155 QualType NewPromotionType,
4156 unsigned NumPositiveBits,
4157 unsigned NumNegativeBits) {
4158 assert(!isCompleteDefinition() && "Cannot redefine enums!");
4160 IntegerType = NewType.getTypePtr();
4161 PromotionType = NewPromotionType;
4162 setNumPositiveBits(NumPositiveBits);
4163 setNumNegativeBits(NumNegativeBits);
4164 TagDecl::completeDefinition();
4167 bool EnumDecl::isClosed() const {
4168 if (const auto *A = getAttr<EnumExtensibilityAttr>())
4169 return A->getExtensibility() == EnumExtensibilityAttr::Closed;
4173 bool EnumDecl::isClosedFlag() const {
4174 return isClosed() && hasAttr<FlagEnumAttr>();
4177 bool EnumDecl::isClosedNonFlag() const {
4178 return isClosed() && !hasAttr<FlagEnumAttr>();
4181 TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
4182 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
4183 return MSI->getTemplateSpecializationKind();
4185 return TSK_Undeclared;
4188 void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
4189 SourceLocation PointOfInstantiation) {
4190 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
4191 assert(MSI && "Not an instantiated member enumeration?");
4192 MSI->setTemplateSpecializationKind(TSK);
4193 if (TSK != TSK_ExplicitSpecialization &&
4194 PointOfInstantiation.isValid() &&
4195 MSI->getPointOfInstantiation().isInvalid())
4196 MSI->setPointOfInstantiation(PointOfInstantiation);
4199 EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
4200 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
4201 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
4202 EnumDecl *ED = getInstantiatedFromMemberEnum();
4203 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
4205 return getDefinitionOrSelf(ED);
4209 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
4210 "couldn't find pattern for enum instantiation");
4214 EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
4215 if (SpecializationInfo)
4216 return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
4221 void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
4222 TemplateSpecializationKind TSK) {
4223 assert(!SpecializationInfo && "Member enum is already a specialization");
4224 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
4227 unsigned EnumDecl::getODRHash() {
4232 Hash.AddEnumDecl(this);
4233 setHasODRHash(true);
4234 ODRHash = Hash.CalculateHash();
4238 //===----------------------------------------------------------------------===//
4239 // RecordDecl Implementation
4240 //===----------------------------------------------------------------------===//
4242 RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
4243 DeclContext *DC, SourceLocation StartLoc,
4244 SourceLocation IdLoc, IdentifierInfo *Id,
4245 RecordDecl *PrevDecl)
4246 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4247 assert(classof(static_cast<Decl *>(this)) && "Invalid Kind!");
4248 setHasFlexibleArrayMember(false);
4249 setAnonymousStructOrUnion(false);
4250 setHasObjectMember(false);
4251 setHasVolatileMember(false);
4252 setHasLoadedFieldsFromExternalStorage(false);
4253 setNonTrivialToPrimitiveDefaultInitialize(false);
4254 setNonTrivialToPrimitiveCopy(false);
4255 setNonTrivialToPrimitiveDestroy(false);
4256 setHasNonTrivialToPrimitiveDefaultInitializeCUnion(false);
4257 setHasNonTrivialToPrimitiveDestructCUnion(false);
4258 setHasNonTrivialToPrimitiveCopyCUnion(false);
4259 setParamDestroyedInCallee(false);
4260 setArgPassingRestrictions(APK_CanPassInRegs);
4263 RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
4264 SourceLocation StartLoc, SourceLocation IdLoc,
4265 IdentifierInfo *Id, RecordDecl* PrevDecl) {
4266 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
4267 StartLoc, IdLoc, Id, PrevDecl);
4268 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4270 C.getTypeDeclType(R, PrevDecl);
4274 RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
4276 new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
4277 SourceLocation(), nullptr, nullptr);
4278 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4282 bool RecordDecl::isInjectedClassName() const {
4283 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
4284 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
4287 bool RecordDecl::isLambda() const {
4288 if (auto RD = dyn_cast<CXXRecordDecl>(this))
4289 return RD->isLambda();
4293 bool RecordDecl::isCapturedRecord() const {
4294 return hasAttr<CapturedRecordAttr>();
4297 void RecordDecl::setCapturedRecord() {
4298 addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
4301 RecordDecl::field_iterator RecordDecl::field_begin() const {
4302 if (hasExternalLexicalStorage() && !hasLoadedFieldsFromExternalStorage())
4303 LoadFieldsFromExternalStorage();
4305 return field_iterator(decl_iterator(FirstDecl));
4308 /// completeDefinition - Notes that the definition of this type is now
4310 void RecordDecl::completeDefinition() {
4311 assert(!isCompleteDefinition() && "Cannot redefine record!");
4312 TagDecl::completeDefinition();
4315 /// isMsStruct - Get whether or not this record uses ms_struct layout.
4316 /// This which can be turned on with an attribute, pragma, or the
4317 /// -mms-bitfields command-line option.
4318 bool RecordDecl::isMsStruct(const ASTContext &C) const {
4319 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
4322 void RecordDecl::LoadFieldsFromExternalStorage() const {
4323 ExternalASTSource *Source = getASTContext().getExternalSource();
4324 assert(hasExternalLexicalStorage() && Source && "No external storage?");
4326 // Notify that we have a RecordDecl doing some initialization.
4327 ExternalASTSource::Deserializing TheFields(Source);
4329 SmallVector<Decl*, 64> Decls;
4330 setHasLoadedFieldsFromExternalStorage(true);
4331 Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
4332 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
4336 // Check that all decls we got were FieldDecls.
4337 for (unsigned i=0, e=Decls.size(); i != e; ++i)
4338 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]));
4344 std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
4345 /*FieldsAlreadyLoaded=*/false);
4348 bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
4349 ASTContext &Context = getASTContext();
4350 const SanitizerMask EnabledAsanMask = Context.getLangOpts().Sanitize.Mask &
4351 (SanitizerKind::Address | SanitizerKind::KernelAddress);
4352 if (!EnabledAsanMask || !Context.getLangOpts().SanitizeAddressFieldPadding)
4354 const auto &Blacklist = Context.getSanitizerBlacklist();
4355 const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
4356 // We may be able to relax some of these requirements.
4357 int ReasonToReject = -1;
4358 if (!CXXRD || CXXRD->isExternCContext())
4359 ReasonToReject = 0; // is not C++.
4360 else if (CXXRD->hasAttr<PackedAttr>())
4361 ReasonToReject = 1; // is packed.
4362 else if (CXXRD->isUnion())
4363 ReasonToReject = 2; // is a union.
4364 else if (CXXRD->isTriviallyCopyable())
4365 ReasonToReject = 3; // is trivially copyable.
4366 else if (CXXRD->hasTrivialDestructor())
4367 ReasonToReject = 4; // has trivial destructor.
4368 else if (CXXRD->isStandardLayout())
4369 ReasonToReject = 5; // is standard layout.
4370 else if (Blacklist.isBlacklistedLocation(EnabledAsanMask, getLocation(),
4372 ReasonToReject = 6; // is in a blacklisted file.
4373 else if (Blacklist.isBlacklistedType(EnabledAsanMask,
4374 getQualifiedNameAsString(),
4376 ReasonToReject = 7; // is blacklisted.
4379 if (ReasonToReject >= 0)
4380 Context.getDiagnostics().Report(
4382 diag::remark_sanitize_address_insert_extra_padding_rejected)
4383 << getQualifiedNameAsString() << ReasonToReject;
4385 Context.getDiagnostics().Report(
4387 diag::remark_sanitize_address_insert_extra_padding_accepted)
4388 << getQualifiedNameAsString();
4390 return ReasonToReject < 0;
4393 const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
4394 for (const auto *I : fields()) {
4395 if (I->getIdentifier())
4398 if (const auto *RT = I->getType()->getAs<RecordType>())
4399 if (const FieldDecl *NamedDataMember =
4400 RT->getDecl()->findFirstNamedDataMember())
4401 return NamedDataMember;
4404 // We didn't find a named data member.
4408 //===----------------------------------------------------------------------===//
4409 // BlockDecl Implementation
4410 //===----------------------------------------------------------------------===//
4412 BlockDecl::BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
4413 : Decl(Block, DC, CaretLoc), DeclContext(Block) {
4414 setIsVariadic(false);
4415 setCapturesCXXThis(false);
4416 setBlockMissingReturnType(true);
4417 setIsConversionFromLambda(false);
4418 setDoesNotEscape(false);
4419 setCanAvoidCopyToHeap(false);
4422 void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
4423 assert(!ParamInfo && "Already has param info!");
4425 // Zero params -> null pointer.
4426 if (!NewParamInfo.empty()) {
4427 NumParams = NewParamInfo.size();
4428 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
4429 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
4433 void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
4434 bool CapturesCXXThis) {
4435 this->setCapturesCXXThis(CapturesCXXThis);
4436 this->NumCaptures = Captures.size();
4438 if (Captures.empty()) {
4439 this->Captures = nullptr;
4443 this->Captures = Captures.copy(Context).data();
4446 bool BlockDecl::capturesVariable(const VarDecl *variable) const {
4447 for (const auto &I : captures())
4448 // Only auto vars can be captured, so no redeclaration worries.
4449 if (I.getVariable() == variable)
4455 SourceRange BlockDecl::getSourceRange() const {
4456 return SourceRange(getLocation(), Body ? Body->getEndLoc() : getLocation());
4459 //===----------------------------------------------------------------------===//
4460 // Other Decl Allocation/Deallocation Method Implementations
4461 //===----------------------------------------------------------------------===//
4463 void TranslationUnitDecl::anchor() {}
4465 TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
4466 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4469 void PragmaCommentDecl::anchor() {}
4471 PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
4472 TranslationUnitDecl *DC,
4473 SourceLocation CommentLoc,
4474 PragmaMSCommentKind CommentKind,
4476 PragmaCommentDecl *PCD =
4477 new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
4478 PragmaCommentDecl(DC, CommentLoc, CommentKind);
4479 memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
4480 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
4484 PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
4487 return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
4488 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4491 void PragmaDetectMismatchDecl::anchor() {}
4493 PragmaDetectMismatchDecl *
4494 PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
4495 SourceLocation Loc, StringRef Name,
4497 size_t ValueStart = Name.size() + 1;
4498 PragmaDetectMismatchDecl *PDMD =
4499 new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
4500 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
4501 memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
4502 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
4503 memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
4505 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
4509 PragmaDetectMismatchDecl *
4510 PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4511 unsigned NameValueSize) {
4512 return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
4513 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4516 void ExternCContextDecl::anchor() {}
4518 ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
4519 TranslationUnitDecl *DC) {
4520 return new (C, DC) ExternCContextDecl(DC);
4523 void LabelDecl::anchor() {}
4525 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4526 SourceLocation IdentL, IdentifierInfo *II) {
4527 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4530 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4531 SourceLocation IdentL, IdentifierInfo *II,
4532 SourceLocation GnuLabelL) {
4533 assert(GnuLabelL != IdentL && "Use this only for GNU local labels");
4534 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4537 LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4538 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
4542 void LabelDecl::setMSAsmLabel(StringRef Name) {
4543 char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
4544 memcpy(Buffer, Name.data(), Name.size());
4545 Buffer[Name.size()] = '\0';
4549 void ValueDecl::anchor() {}
4551 bool ValueDecl::isWeak() const {
4552 for (const auto *I : attrs())
4553 if (isa<WeakAttr>(I) || isa<WeakRefAttr>(I))
4556 return isWeakImported();
4559 void ImplicitParamDecl::anchor() {}
4561 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
4562 SourceLocation IdLoc,
4563 IdentifierInfo *Id, QualType Type,
4564 ImplicitParamKind ParamKind) {
4565 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type, ParamKind);
4568 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, QualType Type,
4569 ImplicitParamKind ParamKind) {
4570 return new (C, nullptr) ImplicitParamDecl(C, Type, ParamKind);
4573 ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
4575 return new (C, ID) ImplicitParamDecl(C, QualType(), ImplicitParamKind::Other);
4578 FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
4579 SourceLocation StartLoc,
4580 const DeclarationNameInfo &NameInfo,
4581 QualType T, TypeSourceInfo *TInfo,
4582 StorageClass SC, bool isInlineSpecified,
4583 bool hasWrittenPrototype,
4584 ConstexprSpecKind ConstexprKind) {
4586 new (C, DC) FunctionDecl(Function, C, DC, StartLoc, NameInfo, T, TInfo,
4587 SC, isInlineSpecified, ConstexprKind);
4588 New->setHasWrittenPrototype(hasWrittenPrototype);
4592 FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4593 return new (C, ID) FunctionDecl(Function, C, nullptr, SourceLocation(),
4594 DeclarationNameInfo(), QualType(), nullptr,
4595 SC_None, false, CSK_unspecified);
4598 BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4599 return new (C, DC) BlockDecl(DC, L);
4602 BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4603 return new (C, ID) BlockDecl(nullptr, SourceLocation());
4606 CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
4607 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
4608 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
4610 CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
4611 unsigned NumParams) {
4612 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4613 CapturedDecl(DC, NumParams);
4616 CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4617 unsigned NumParams) {
4618 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4619 CapturedDecl(nullptr, NumParams);
4622 Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
4623 void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
4625 bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
4626 void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
4628 EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
4630 IdentifierInfo *Id, QualType T,
4631 Expr *E, const llvm::APSInt &V) {
4632 return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
4636 EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4637 return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
4638 QualType(), nullptr, llvm::APSInt());
4641 void IndirectFieldDecl::anchor() {}
4643 IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
4644 SourceLocation L, DeclarationName N,
4646 MutableArrayRef<NamedDecl *> CH)
4647 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
4648 ChainingSize(CH.size()) {
4649 // In C++, indirect field declarations conflict with tag declarations in the
4650 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
4651 if (C.getLangOpts().CPlusPlus)
4652 IdentifierNamespace |= IDNS_Tag;
4656 IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
4657 IdentifierInfo *Id, QualType T,
4658 llvm::MutableArrayRef<NamedDecl *> CH) {
4659 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
4662 IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
4664 return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
4665 DeclarationName(), QualType(), None);
4668 SourceRange EnumConstantDecl::getSourceRange() const {
4669 SourceLocation End = getLocation();
4671 End = Init->getEndLoc();
4672 return SourceRange(getLocation(), End);
4675 void TypeDecl::anchor() {}
4677 TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
4678 SourceLocation StartLoc, SourceLocation IdLoc,
4679 IdentifierInfo *Id, TypeSourceInfo *TInfo) {
4680 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4683 void TypedefNameDecl::anchor() {}
4685 TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
4686 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
4687 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
4688 auto *ThisTypedef = this;
4689 if (AnyRedecl && OwningTypedef) {
4690 OwningTypedef = OwningTypedef->getCanonicalDecl();
4691 ThisTypedef = ThisTypedef->getCanonicalDecl();
4693 if (OwningTypedef == ThisTypedef)
4694 return TT->getDecl();
4700 bool TypedefNameDecl::isTransparentTagSlow() const {
4701 auto determineIsTransparent = [&]() {
4702 if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
4703 if (auto *TD = TT->getDecl()) {
4704 if (TD->getName() != getName())
4706 SourceLocation TTLoc = getLocation();
4707 SourceLocation TDLoc = TD->getLocation();
4708 if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
4710 SourceManager &SM = getASTContext().getSourceManager();
4711 return SM.getSpellingLoc(TTLoc) == SM.getSpellingLoc(TDLoc);
4717 bool isTransparent = determineIsTransparent();
4718 MaybeModedTInfo.setInt((isTransparent << 1) | 1);
4719 return isTransparent;
4722 TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4723 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
4727 TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
4728 SourceLocation StartLoc,
4729 SourceLocation IdLoc, IdentifierInfo *Id,
4730 TypeSourceInfo *TInfo) {
4731 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4734 TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4735 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
4736 SourceLocation(), nullptr, nullptr);
4739 SourceRange TypedefDecl::getSourceRange() const {
4740 SourceLocation RangeEnd = getLocation();
4741 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
4742 if (typeIsPostfix(TInfo->getType()))
4743 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4745 return SourceRange(getBeginLoc(), RangeEnd);
4748 SourceRange TypeAliasDecl::getSourceRange() const {
4749 SourceLocation RangeEnd = getBeginLoc();
4750 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
4751 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4752 return SourceRange(getBeginLoc(), RangeEnd);
4755 void FileScopeAsmDecl::anchor() {}
4757 FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
4759 SourceLocation AsmLoc,
4760 SourceLocation RParenLoc) {
4761 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
4764 FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
4766 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
4770 void EmptyDecl::anchor() {}
4772 EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4773 return new (C, DC) EmptyDecl(DC, L);
4776 EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4777 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
4780 //===----------------------------------------------------------------------===//
4781 // ImportDecl Implementation
4782 //===----------------------------------------------------------------------===//
4784 /// Retrieve the number of module identifiers needed to name the given
4786 static unsigned getNumModuleIdentifiers(Module *Mod) {
4787 unsigned Result = 1;
4788 while (Mod->Parent) {
4795 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4797 ArrayRef<SourceLocation> IdentifierLocs)
4798 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, true) {
4799 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size());
4800 auto *StoredLocs = getTrailingObjects<SourceLocation>();
4801 std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
4805 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4806 Module *Imported, SourceLocation EndLoc)
4807 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, false) {
4808 *getTrailingObjects<SourceLocation>() = EndLoc;
4811 ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
4812 SourceLocation StartLoc, Module *Imported,
4813 ArrayRef<SourceLocation> IdentifierLocs) {
4815 additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
4816 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
4819 ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
4820 SourceLocation StartLoc,
4822 SourceLocation EndLoc) {
4823 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
4824 ImportDecl(DC, StartLoc, Imported, EndLoc);
4825 Import->setImplicit();
4829 ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4830 unsigned NumLocations) {
4831 return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
4832 ImportDecl(EmptyShell());
4835 ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
4836 if (!ImportedAndComplete.getInt())
4839 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
4840 return llvm::makeArrayRef(StoredLocs,
4841 getNumModuleIdentifiers(getImportedModule()));
4844 SourceRange ImportDecl::getSourceRange() const {
4845 if (!ImportedAndComplete.getInt())
4846 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
4848 return SourceRange(getLocation(), getIdentifierLocs().back());
4851 //===----------------------------------------------------------------------===//
4852 // ExportDecl Implementation
4853 //===----------------------------------------------------------------------===//
4855 void ExportDecl::anchor() {}
4857 ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
4858 SourceLocation ExportLoc) {
4859 return new (C, DC) ExportDecl(DC, ExportLoc);
4862 ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4863 return new (C, ID) ExportDecl(nullptr, SourceLocation());